231686497 has 4 divisors (see below), whose sum is σ = 264784576. Its totient is φ = 198588420.

The previous prime is 231686471. The next prime is 231686501. The reversal of 231686497 is 794686132.

231686497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231686497 - 2²³ = 223297889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231686447) 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, 16549029 + ... + 16549042.

It is an arithmetic number, because the mean of its divisors is an integer number (66196144).

Almost surely, 2^231686497 is an apocalyptic number.

It is an amenable number.

231686497 is a deficient number, since it is larger than the sum of its proper divisors (33098079).

231686497 is an equidigital number, since it uses as much as digits as its factorization.

231686497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33098078.

The product of its digits is 435456, while the sum is 46.

The square root of 231686497 is about 15221.2514925679. The cubic root of 231686497 is about 614.1864643560.

The spelling of 231686497 in words is "two hundred thirty-one million, six hundred eighty-six thousand, four hundred ninety-seven".