16131231 has 10 divisors (see below), whose sum is σ = 24097392. Its totient is φ = 10754100.

The previous prime is 16131229. The next prime is 16131233. The reversal of 16131231 is 13213161.

It is an interprime number because it is at equal distance from previous prime (16131229) and next prime (16131233).

It is not a de Polignac number, because 16131231 - 2¹ = 16131229 is a prime.

It is a super-2 number, since 2×16131231² = 520433227150722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16131233) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 99495 + ... + 99656.

Almost surely, 2^16131231 is an apocalyptic number.

16131231 is a deficient number, since it is larger than the sum of its proper divisors (7966161).

16131231 is an equidigital number, since it uses as much as digits as its factorization.

16131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199163 (or 199154 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 16131231 is about 4016.3703763473. The cubic root of 16131231 is about 252.6712546033.

Adding to 16131231 its reverse (13213161), we get a palindrome (29344392).

The spelling of 16131231 in words is "sixteen million, one hundred thirty-one thousand, two hundred thirty-one".