331557641 has 2 divisors, whose sum is σ = 331557642. Its totient is φ = 331557640.

The previous prime is 331557587. The next prime is 331557661. The reversal of 331557641 is 146755133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 330476041 + 1081600 = 18179^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 331557641 - 2¹⁴ = 331541257 is a prime.

It is a Chen prime.

It is equal to p_17864702 and since 331557641 and 17864702 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (331557661) 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, 165778820 + 165778821.

It is an arithmetic number, because the mean of its divisors is an integer number (165778821).

Almost surely, 2^331557641 is an apocalyptic number.

It is an amenable number.

331557641 is a deficient number, since it is larger than the sum of its proper divisors (1).

331557641 is an equidigital number, since it uses as much as digits as its factorization.

331557641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 35.

The square root of 331557641 is about 18208.7243100663. The cubic root of 331557641 is about 692.1278853325.

The spelling of 331557641 in words is "three hundred thirty-one million, five hundred fifty-seven thousand, six hundred forty-one".