13697231 has 4 divisors (see below), whose sum is σ = 13710552. Its totient is φ = 13683912.

The previous prime is 13697221. The next prime is 13697237. The reversal of 13697231 is 13279631.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13697231 is a prime.

It is a super-2 number, since 2×13697231² = 375228274134722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13697237) 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, 4976 + ... + 7221.

It is an arithmetic number, because the mean of its divisors is an integer number (3427638).

Almost surely, 2^13697231 is an apocalyptic number.

13697231 is a deficient number, since it is larger than the sum of its proper divisors (13321).

13697231 is a wasteful number, since it uses less digits than its factorization.

13697231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13320.

The product of its digits is 6804, while the sum is 32.

The square root of 13697231 is about 3700.9770331630. The cubic root of 13697231 is about 239.2641291331.

The spelling of 13697231 in words is "thirteen million, six hundred ninety-seven thousand, two hundred thirty-one".