231157311 has 24 divisors (see below), whose sum is σ = 387176832. Its totient is φ = 120080400.

The previous prime is 231157301. The next prime is 231157321. The reversal of 231157311 is 113751132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (231157301) and next prime (231157321).

It is not a de Polignac number, because 231157311 - 2¹⁴ = 231140927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231157301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42945 + ... + 48026.

It is an arithmetic number, because the mean of its divisors is an integer number (16132368).

Almost surely, 2^231157311 is an apocalyptic number.

231157311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

231157311 is a deficient number, since it is larger than the sum of its proper divisors (156019521).

231157311 is a wasteful number, since it uses less digits than its factorization.

231157311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91003 (or 90992 counting only the distinct ones).

The product of its digits is 630, while the sum is 24.

The square root of 231157311 is about 15203.8584247552. The cubic root of 231157311 is about 613.7184948494.

The spelling of 231157311 in words is "two hundred thirty-one million, one hundred fifty-seven thousand, three hundred eleven".