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70181 is a prime number
BaseRepresentation
bin10001001000100101
310120021022
4101020211
54221211
61300525
7411416
oct211045
9116238
1070181
1148801
1234745
1325c37
141b80d
1515bdb
hex11225

70181 has 2 divisors, whose sum is σ = 70182. Its totient is φ = 70180.

The previous prime is 70177. The next prime is 70183. The reversal of 70181 is 18107.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58081 + 12100 = 241^2 + 110^2 .

It is a cyclic number.

It is not a de Polignac number, because 70181 - 22 = 70177 is a prime.

It is a super-2 number, since 2×701812 = 9850745522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 70183, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 70181.

It is not a weakly prime, because it can be changed into another prime (70183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35090 + 35091.

It is an arithmetic number, because the mean of its divisors is an integer number (35091).

270181 is an apocalyptic number.

It is an amenable number.

70181 is a deficient number, since it is larger than the sum of its proper divisors (1).

70181 is an equidigital number, since it uses as much as digits as its factorization.

70181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 70181 is about 264.9169681240. The cubic root of 70181 is about 41.2483439800.

Subtracting from 70181 its product of nonzero digits (56), we obtain a triangular number (70125 = T374).

Adding to 70181 its reverse (18107), we get a palindrome (88288).

The spelling of 70181 in words is "seventy thousand, one hundred eighty-one".