402031231 has 6 divisors (see below), whose sum is σ = 467669040. Its totient is φ = 344598156.

The previous prime is 402031193. The next prime is 402031247. The reversal of 402031231 is 132130204.

It is a happy number.

It is not a de Polignac number, because 402031231 - 2⁷ = 402031103 is a prime.

It is a super-2 number, since 2×402031231² = 323258221398750722, 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 (402031261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4102311 + ... + 4102408.

It is an arithmetic number, because the mean of its divisors is an integer number (77944840).

Almost surely, 2^402031231 is an apocalyptic number.

402031231 is a deficient number, since it is larger than the sum of its proper divisors (65637809).

402031231 is an equidigital number, since it uses as much as digits as its factorization.

402031231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8204733 (or 8204726 counting only the distinct ones).

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

The square root of 402031231 is about 20050.7164709893. The cubic root of 402031231 is about 738.0513810580.

Adding to 402031231 its reverse (132130204), we get a palindrome (534161435).

The spelling of 402031231 in words is "four hundred two million, thirty-one thousand, two hundred thirty-one".