405136631 has 2 divisors, whose sum is σ = 405136632. Its totient is φ = 405136630.

The previous prime is 405136597. The next prime is 405136649. The reversal of 405136631 is 136631504.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 405136631 - 2²² = 400942327 is a prime.

It is a super-2 number, since 2×405136631² = 328271379556060322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 405136594 and 405136603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405136331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202568315 + 202568316.

It is an arithmetic number, because the mean of its divisors is an integer number (202568316).

Almost surely, 2^405136631 is an apocalyptic number.

405136631 is a deficient number, since it is larger than the sum of its proper divisors (1).

405136631 is an equidigital number, since it uses as much as digits as its factorization.

405136631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 405136631 is about 20128.0061357304. The cubic root of 405136631 is about 739.9468131971.

The spelling of 405136631 in words is "four hundred five million, one hundred thirty-six thousand, six hundred thirty-one".