231490861 has 8 divisors (see below), whose sum is σ = 264654464. Its totient is φ = 198350640.

The previous prime is 231490849. The next prime is 231490867. The reversal of 231490861 is 168094132.

231490861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231490861 - 2⁹ = 231490349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231490867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30256 + ... + 37126.

It is an arithmetic number, because the mean of its divisors is an integer number (33081808).

Almost surely, 2^231490861 is an apocalyptic number.

It is an amenable number.

231490861 is a deficient number, since it is larger than the sum of its proper divisors (33163603).

231490861 is an equidigital number, since it uses as much as digits as its factorization.

231490861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11691.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 231490861 is about 15214.8237255645. The cubic root of 231490861 is about 614.0135427274.

The spelling of 231490861 in words is "two hundred thirty-one million, four hundred ninety thousand, eight hundred sixty-one".