231157 has 4 divisors (see below), whose sum is σ = 232960. Its totient is φ = 229356.

The previous prime is 231131. The next prime is 231169. The reversal of 231157 is 751132.

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 a de Polignac number, because none of the positive numbers 2^k-231157 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 (231107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693 + ... + 970.

It is an arithmetic number, because the mean of its divisors is an integer number (58240).

2²³¹¹⁵⁷ is an apocalyptic number.

It is an amenable number.

231157 is a deficient number, since it is larger than the sum of its proper divisors (1803).

231157 is a wasteful number, since it uses less digits than its factorization.

231157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1802.

The product of its digits is 210, while the sum is 19.

The square root of 231157 is about 480.7878950223. The cubic root of 231157 is about 61.3718219616.

Adding to 231157 its reverse (751132), we get a palindrome (982289).

The spelling of 231157 in words is "two hundred thirty-one thousand, one hundred fifty-seven".