70178981 has 2 divisors, whose sum is σ = 70178982. Its totient is φ = 70178980.

The previous prime is 70178971. The next prime is 70178993. The reversal of 70178981 is 18987107.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65044225 + 5134756 = 8065^2 + 2266^2 .

It is a cyclic number.

It is not a de Polignac number, because 70178981 - 2¹⁸ = 69916837 is a prime.

It is a super-2 number, since 2×70178981² = 9850178748396722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen 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 (70178971) 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, 35089490 + 35089491.

It is an arithmetic number, because the mean of its divisors is an integer number (35089491).

Almost surely, 2^70178981 is an apocalyptic number.

It is an amenable number.

70178981 is a deficient number, since it is larger than the sum of its proper divisors (1).

70178981 is an equidigital number, since it uses as much as digits as its factorization.

70178981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 70178981 is about 8377.2895974772. The cubic root of 70178981 is about 412.4794842567.

The spelling of 70178981 in words is "seventy million, one hundred seventy-eight thousand, nine hundred eighty-one".