406518631 has 2 divisors, whose sum is σ = 406518632. Its totient is φ = 406518630.

The previous prime is 406518599. The next prime is 406518641. The reversal of 406518631 is 136815604.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 406518631 - 2⁵ = 406518599 is a prime.

It is a super-2 number, since 2×406518631² = 330514794700228322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406518641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203259315 + 203259316.

It is an arithmetic number, because the mean of its divisors is an integer number (203259316).

Almost surely, 2^406518631 is an apocalyptic number.

406518631 is a deficient number, since it is larger than the sum of its proper divisors (1).

406518631 is an equidigital number, since it uses as much as digits as its factorization.

406518631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 406518631 is about 20162.3071844469. The cubic root of 406518631 is about 740.7872259091.

The spelling of 406518631 in words is "four hundred six million, five hundred eighteen thousand, six hundred thirty-one".