331081 has 2 divisors, whose sum is σ = 331082. Its totient is φ = 331080.

The previous prime is 331063. The next prime is 331099. The reversal of 331081 is 180133.

It is a balanced prime because it is at equal distance from previous prime (331063) and next prime (331099).

It can be written as a sum of positive squares in only one way, i.e., 241081 + 90000 = 491^2 + 300^2 .

It is a cyclic number.

It is not a de Polignac number, because 331081 - 2⁹ = 330569 is a prime.

It is a super-2 number, since 2×331081² = 219229257122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165540 + 165541.

It is an arithmetic number, because the mean of its divisors is an integer number (165541).

2³³¹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

331081 is a deficient number, since it is larger than the sum of its proper divisors (1).

331081 is an equidigital number, since it uses as much as digits as its factorization.

331081 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 16.

The square root of 331081 is about 575.3963851120. The cubic root of 331081 is about 69.1796062951.

The spelling of 331081 in words is "three hundred thirty-one thousand, eighty-one".