231523131 has 8 divisors (see below), whose sum is σ = 352797184. Its totient is φ = 132298920.

The previous prime is 231523111. The next prime is 231523147. The reversal of 231523131 is 131325132.

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

It is not a de Polignac number, because 231523131 - 2⁶ = 231523067 is a prime.

It is a super-2 number, since 2×231523131² = 107205920376086322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 11024911 = 231523131 / (2 + 3 + 1 + 5 + 2 + 3 + 1 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231523098 and 231523107.

It is not an unprimeable number, because it can be changed into a prime (231523111) 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, 5512435 + ... + 5512476.

It is an arithmetic number, because the mean of its divisors is an integer number (44099648).

Almost surely, 2^231523131 is an apocalyptic number.

231523131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

231523131 is a deficient number, since it is larger than the sum of its proper divisors (121274053).

231523131 is a wasteful number, since it uses less digits than its factorization.

231523131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11024921.

The product of its digits is 540, while the sum is 21.

The square root of 231523131 is about 15215.8841675402. The cubic root of 231523131 is about 614.0420727182.

Adding to 231523131 its reverse (131325132), we get a palindrome (362848263).

The spelling of 231523131 in words is "two hundred thirty-one million, five hundred twenty-three thousand, one hundred thirty-one".