70601981 has 2 divisors, whose sum is σ = 70601982. Its totient is φ = 70601980.

The previous prime is 70601963. The next prime is 70602047. The reversal of 70601981 is 18910607.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69039481 + 1562500 = 8309^2 + 1250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70601981 is a prime.

It is a super-2 number, since 2×70601981² = 9969279442248722, 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 (70601941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35300990 + 35300991.

It is an arithmetic number, because the mean of its divisors is an integer number (35300991).

Almost surely, 2^70601981 is an apocalyptic number.

It is an amenable number.

70601981 is a deficient number, since it is larger than the sum of its proper divisors (1).

70601981 is an equidigital number, since it uses as much as digits as its factorization.

70601981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 70601981 is about 8402.4984974709. The cubic root of 70601981 is about 413.3065573330.

The spelling of 70601981 in words is "seventy million, six hundred one thousand, nine hundred eighty-one".