331901 has 4 divisors (see below), whose sum is σ = 337404. Its totient is φ = 326400.

The previous prime is 331897. The next prime is 331907. The reversal of 331901 is 109133.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 106276 + 225625 = 326^2 + 475^2 .

It is a cyclic number.

It is not a de Polignac number, because 331901 - 2² = 331897 is a prime.

It is a super-2 number, since 2×331901² = 220316547602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 331901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2660 + ... + 2781.

It is an arithmetic number, because the mean of its divisors is an integer number (84351).

2³³¹⁹⁰¹ is an apocalyptic number.

It is an amenable number.

331901 is a deficient number, since it is larger than the sum of its proper divisors (5503).

331901 is an equidigital number, since it uses as much as digits as its factorization.

331901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5502.

The product of its (nonzero) digits is 81, while the sum is 17.

The square root of 331901 is about 576.1084967261. The cubic root of 331901 is about 69.2366723995.

It can be divided in two parts, 3 and 31901, that multiplied together give a triangular number (95703 = T₄₃₇).

The spelling of 331901 in words is "three hundred thirty-one thousand, nine hundred one".