331551401 has 2 divisors, whose sum is σ = 331551402. Its totient is φ = 331551400.

The previous prime is 331551397. The next prime is 331551421. The reversal of 331551401 is 104155133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182223001 + 149328400 = 13499^2 + 12220^2 .

It is a cyclic number.

It is not a de Polignac number, because 331551401 - 2² = 331551397 is a prime.

It is not a weakly prime, because it can be changed into another prime (331551421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165775700 + 165775701.

It is an arithmetic number, because the mean of its divisors is an integer number (165775701).

Almost surely, 2^331551401 is an apocalyptic number.

It is an amenable number.

331551401 is a deficient number, since it is larger than the sum of its proper divisors (1).

331551401 is an equidigital number, since it uses as much as digits as its factorization.

331551401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 331551401 is about 18208.5529628249. The cubic root of 331551401 is about 692.1235432971.

The spelling of 331551401 in words is "three hundred thirty-one million, five hundred fifty-one thousand, four hundred one".