70945681 has 2 divisors, whose sum is σ = 70945682. Its totient is φ = 70945680.

The previous prime is 70945649. The next prime is 70945723. The reversal of 70945681 is 18654907.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37015056 + 33930625 = 6084^2 + 5825^2 .

It is a cyclic number.

It is not a de Polignac number, because 70945681 - 2⁵ = 70945649 is a prime.

It is a super-2 number, since 2×70945681² = 10066579305107522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (70945181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35472840 + 35472841.

It is an arithmetic number, because the mean of its divisors is an integer number (35472841).

Almost surely, 2^70945681 is an apocalyptic number.

It is an amenable number.

70945681 is a deficient number, since it is larger than the sum of its proper divisors (1).

70945681 is an equidigital number, since it uses as much as digits as its factorization.

70945681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 70945681 is about 8422.9259168059. The cubic root of 70945681 is about 413.9761493724.

The spelling of 70945681 in words is "seventy million, nine hundred forty-five thousand, six hundred eighty-one".