231691903 has 8 divisors (see below), whose sum is σ = 242458848. Its totient is φ = 220982784.

The previous prime is 231691883. The next prime is 231691907. The reversal of 231691903 is 309196132.

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 231691903 - 2¹⁷ = 231560831 is a prime.

It is a super-2 number, since 2×231691903² = 107362275831522818, 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 (231691907) 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, 6150 + ... + 22387.

It is an arithmetic number, because the mean of its divisors is an integer number (30307356).

Almost surely, 2^231691903 is an apocalyptic number.

231691903 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

231691903 is a deficient number, since it is larger than the sum of its proper divisors (10766945).

231691903 is a wasteful number, since it uses less digits than its factorization.

231691903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28913.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 231691903 is about 15221.4290721995. The cubic root of 231691903 is about 614.1912413086.

The spelling of 231691903 in words is "two hundred thirty-one million, six hundred ninety-one thousand, nine hundred three".