231545131 has 8 divisors (see below), whose sum is σ = 232897280. Its totient is φ = 230197248.

The previous prime is 231545113. The next prime is 231545143. The reversal of 231545131 is 131545132.

It is a happy number.

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 231545131 - 2¹³ = 231536939 is a prime.

It is a super-2 number, since 2×231545131² = 107226295379614322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231545096 and 231545105.

It is not an unprimeable number, because it can be changed into a prime (231545101) 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, 212470 + ... + 213556.

It is an arithmetic number, because the mean of its divisors is an integer number (29112160).

Almost surely, 2^231545131 is an apocalyptic number.

231545131 is a deficient number, since it is larger than the sum of its proper divisors (1352149).

231545131 is a wasteful number, since it uses less digits than its factorization.

231545131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133.

The product of its digits is 1800, while the sum is 25.

The square root of 231545131 is about 15216.6070791093. The cubic root of 231545131 is about 614.0615214556.

Subtracting from 231545131 its reverse (131545132), we obtain a palindrome (99999999).

The spelling of 231545131 in words is "two hundred thirty-one million, five hundred forty-five thousand, one hundred thirty-one".