70405631 has 2 divisors, whose sum is σ = 70405632. Its totient is φ = 70405630.

The previous prime is 70405609. The next prime is 70405661. The reversal of 70405631 is 13650407.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70405631 is a prime.

It is a super-2 number, since 2×70405631² = 9913905753016322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70405631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70405661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35202815 + 35202816.

It is an arithmetic number, because the mean of its divisors is an integer number (35202816).

Almost surely, 2^70405631 is an apocalyptic number.

70405631 is a deficient number, since it is larger than the sum of its proper divisors (1).

70405631 is an equidigital number, since it uses as much as digits as its factorization.

70405631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 70405631 is about 8390.8063378915. The cubic root of 70405631 is about 412.9230549219.

The spelling of 70405631 in words is "seventy million, four hundred five thousand, six hundred thirty-one".