402631 has 2 divisors, whose sum is σ = 402632. Its totient is φ = 402630.

The previous prime is 402613. The next prime is 402691. The reversal of 402631 is 136204.

Together with previous prime (402613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402631 - 2⁷ = 402503 is a prime.

It is a super-2 number, since 2×402631² = 324223444322, which contains 22 as substring.

It is a plaindrome in base 11 and base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201315 + 201316.

It is an arithmetic number, because the mean of its divisors is an integer number (201316).

2⁴⁰²⁶³¹ is an apocalyptic number.

402631 is a deficient number, since it is larger than the sum of its proper divisors (1).

402631 is an equidigital number, since it uses as much as digits as its factorization.

402631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 402631 is about 634.5321110866. The cubic root of 402631 is about 73.8418218557.

Adding to 402631 its reverse (136204), we get a palindrome (538835).

The spelling of 402631 in words is "four hundred two thousand, six hundred thirty-one".