331665401 has 2 divisors, whose sum is σ = 331665402. Its totient is φ = 331665400.

The previous prime is 331665379. The next prime is 331665409. The reversal of 331665401 is 104566133.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192543376 + 139122025 = 13876^2 + 11795^2 .

It is a cyclic number.

It is not a de Polignac number, because 331665401 - 2²² = 327471097 is a prime.

It is a super-2 number, since 2×331665401² = 220003876440981602, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (331665409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165832700 + 165832701.

It is an arithmetic number, because the mean of its divisors is an integer number (165832701).

Almost surely, 2^331665401 is an apocalyptic number.

It is an amenable number.

331665401 is a deficient number, since it is larger than the sum of its proper divisors (1).

331665401 is an equidigital number, since it uses as much as digits as its factorization.

331665401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 331665401 is about 18211.6830908074. The cubic root of 331665401 is about 692.2028603524.

The spelling of 331665401 in words is "three hundred thirty-one million, six hundred sixty-five thousand, four hundred one".