70885981 has 2 divisors, whose sum is σ = 70885982. Its totient is φ = 70885980.

The previous prime is 70885921. The next prime is 70885987. The reversal of 70885981 is 18958807.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38007225 + 32878756 = 6165^2 + 5734^2 .

It is a cyclic number.

It is not a de Polignac number, because 70885981 - 2⁷ = 70885853 is a prime.

It is a super-2 number, since 2×70885981² = 10049644604664722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70885987) 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, 35442990 + 35442991.

It is an arithmetic number, because the mean of its divisors is an integer number (35442991).

Almost surely, 2^70885981 is an apocalyptic number.

It is an amenable number.

70885981 is a deficient number, since it is larger than the sum of its proper divisors (1).

70885981 is an equidigital number, since it uses as much as digits as its factorization.

70885981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 46.

The square root of 70885981 is about 8419.3812718038. The cubic root of 70885981 is about 413.8599980141.

The spelling of 70885981 in words is "seventy million, eight hundred eighty-five thousand, nine hundred eighty-one".