402501331 has 2 divisors, whose sum is σ = 402501332. Its totient is φ = 402501330.

The previous prime is 402501313. The next prime is 402501409. The reversal of 402501331 is 133105204.

Together with previous prime (402501313) 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 402501331 - 2²³ = 394112723 is a prime.

It is a super-2 number, since 2×402501331² = 324014642913543122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 402501299 and 402501308.

It is not a weakly prime, because it can be changed into another prime (402501131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201250665 + 201250666.

It is an arithmetic number, because the mean of its divisors is an integer number (201250666).

Almost surely, 2^402501331 is an apocalyptic number.

402501331 is a deficient number, since it is larger than the sum of its proper divisors (1).

402501331 is an equidigital number, since it uses as much as digits as its factorization.

402501331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 402501331 is about 20062.4358192120. The cubic root of 402501331 is about 738.3389398190.

Adding to 402501331 its reverse (133105204), we get a palindrome (535606535).

The spelling of 402501331 in words is "four hundred two million, five hundred one thousand, three hundred thirty-one".