331201231 has 2 divisors, whose sum is σ = 331201232. Its totient is φ = 331201230.

The previous prime is 331201229. The next prime is 331201237. The reversal of 331201231 is 132102133.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 331201231 - 2¹ = 331201229 is a prime.

It is a super-2 number, since 2×331201231² = 219388510831830722, which contains 22 as substring.

Together with 331201229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331201237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165600615 + 165600616.

It is an arithmetic number, because the mean of its divisors is an integer number (165600616).

Almost surely, 2^331201231 is an apocalyptic number.

331201231 is a deficient number, since it is larger than the sum of its proper divisors (1).

331201231 is an equidigital number, since it uses as much as digits as its factorization.

331201231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 331201231 is about 18198.9348864157. The cubic root of 331201231 is about 691.8797939879.

Adding to 331201231 its reverse (132102133), we get a palindrome (463303364).

The spelling of 331201231 in words is "three hundred thirty-one million, two hundred one thousand, two hundred thirty-one".