70945181 has 2 divisors, whose sum is σ = 70945182. Its totient is φ = 70945180.

The previous prime is 70945177. The next prime is 70945187. The reversal of 70945181 is 18154907.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54257956 + 16687225 = 7366^2 + 4085^2 .

It is a cyclic number.

It is not a de Polignac number, because 70945181 - 2² = 70945177 is a prime.

It is a super-2 number, since 2×70945181² = 10066437414245522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70945187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35472590 + 35472591.

It is an arithmetic number, because the mean of its divisors is an integer number (35472591).

Almost surely, 2^70945181 is an apocalyptic number.

It is an amenable number.

70945181 is a deficient number, since it is larger than the sum of its proper divisors (1).

70945181 is an equidigital number, since it uses as much as digits as its factorization.

70945181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 70945181 is about 8422.8962358562. The cubic root of 70945181 is about 413.9751768511.

The spelling of 70945181 in words is "seventy million, nine hundred forty-five thousand, one hundred eighty-one".