402331 has 2 divisors, whose sum is σ = 402332. Its totient is φ = 402330.

The previous prime is 402329. The next prime is 402341. The reversal of 402331 is 133204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402331 - 2¹ = 402329 is a prime.

It is a super-2 number, since 2×402331² = 323740467122, which contains 22 as substring.

Together with 402329, it forms a pair of twin primes.

It is an Ulam number.

402331 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (402341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201165 + 201166.

It is an arithmetic number, because the mean of its divisors is an integer number (201166).

2⁴⁰²³³¹ is an apocalyptic number.

402331 is a deficient number, since it is larger than the sum of its proper divisors (1).

402331 is an equidigital number, since it uses as much as digits as its factorization.

402331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 402331 is about 634.2956723800. The cubic root of 402331 is about 73.8234774736.

Adding to 402331 its reverse (133204), we get a palindrome (535535).

The spelling of 402331 in words is "four hundred two thousand, three hundred thirty-one".