231997245 has 16 divisors (see below), whose sum is σ = 383996160. Its totient is φ = 119465024.

The previous prime is 231997237. The next prime is 231997291. The reversal of 231997245 is 542799132.

It is a cyclic number.

It is not a de Polignac number, because 231997245 - 2³ = 231997237 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231997197 and 231997206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266229 + ... + 267098.

It is an arithmetic number, because the mean of its divisors is an integer number (23999760).

Almost surely, 2^231997245 is an apocalyptic number.

It is an amenable number.

231997245 is a deficient number, since it is larger than the sum of its proper divisors (151998915).

231997245 is a wasteful number, since it uses less digits than its factorization.

231997245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533364.

The product of its digits is 136080, while the sum is 42.

The square root of 231997245 is about 15231.4557741537. The cubic root of 231997245 is about 614.4609328767.

The spelling of 231997245 in words is "two hundred thirty-one million, nine hundred ninety-seven thousand, two hundred forty-five".