1157993231 has 4 divisors (see below), whose sum is σ = 1163050200. Its totient is φ = 1152936264.

The previous prime is 1157993201. The next prime is 1157993257. The reversal of 1157993231 is 1323997511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1157993231 - 2²² = 1153798927 is a prime.

It is a super-2 number, since 2×1157993231² = 2681896646083638722, 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 (1157993201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2528141 + ... + 2528598.

It is an arithmetic number, because the mean of its divisors is an integer number (290762550).

Almost surely, 2^1157993231 is an apocalyptic number.

1157993231 is a deficient number, since it is larger than the sum of its proper divisors (5056969).

1157993231 is an equidigital number, since it uses as much as digits as its factorization.

1157993231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5056968.

The product of its digits is 51030, while the sum is 41.

The square root of 1157993231 is about 34029.2995960834. The cubic root of 1157993231 is about 1050.1113203214. Note that the first 3 decimals are identical.

The spelling of 1157993231 in words is "one billion, one hundred fifty-seven million, nine hundred ninety-three thousand, two hundred thirty-one".