331001081 has 2 divisors, whose sum is σ = 331001082. Its totient is φ = 331001080.

The previous prime is 331000973. The next prime is 331001107. The reversal of 331001081 is 180100133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 279391225 + 51609856 = 16715^2 + 7184^2 .

It is a cyclic number.

It is not a de Polignac number, because 331001081 - 2²⁶ = 263892217 is a prime.

It is a super-2 number, since 2×331001081² = 219123431246337122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331001581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165500540 + 165500541.

It is an arithmetic number, because the mean of its divisors is an integer number (165500541).

Almost surely, 2^331001081 is an apocalyptic number.

It is an amenable number.

331001081 is a deficient number, since it is larger than the sum of its proper divisors (1).

331001081 is an equidigital number, since it uses as much as digits as its factorization.

331001081 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 17.

The square root of 331001081 is about 18193.4351072028. The cubic root of 331001081 is about 691.7403947019.

The spelling of 331001081 in words is "three hundred thirty-one million, one thousand, eighty-one".