402631231 has 4 divisors (see below), whose sum is σ = 411994792. Its totient is φ = 393267672.

The previous prime is 402631219. The next prime is 402631237. The reversal of 402631231 is 132136204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402631231 - 2⁵ = 402631199 is a prime.

It is a super-2 number, since 2×402631231² = 324223816353150722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402631237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4681716 + ... + 4681801.

It is an arithmetic number, because the mean of its divisors is an integer number (102998698).

Almost surely, 2^402631231 is an apocalyptic number.

402631231 is a deficient number, since it is larger than the sum of its proper divisors (9363561).

402631231 is an equidigital number, since it uses as much as digits as its factorization.

402631231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9363560.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 402631231 is about 20065.6729515858. The cubic root of 402631231 is about 738.4183597736.

Adding to 402631231 its reverse (132136204), we get a palindrome (534767435).

The spelling of 402631231 in words is "four hundred two million, six hundred thirty-one thousand, two hundred thirty-one".