231132413 has 4 divisors (see below), whose sum is σ = 231382140. Its totient is φ = 230882688.

The previous prime is 231132409. The next prime is 231132427. The reversal of 231132413 is 314231132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 99640324 + 131492089 = 9982^2 + 11467^2 .

It is a cyclic number.

It is not a de Polignac number, because 231132413 - 2² = 231132409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231132403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123470 + ... + 125327.

It is an arithmetic number, because the mean of its divisors is an integer number (57845535).

Almost surely, 2^231132413 is an apocalyptic number.

It is an amenable number.

231132413 is a deficient number, since it is larger than the sum of its proper divisors (249727).

231132413 is an equidigital number, since it uses as much as digits as its factorization.

231132413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249726.

The product of its digits is 432, while the sum is 20.

The square root of 231132413 is about 15203.0395973963. The cubic root of 231132413 is about 613.6964594778.

Adding to 231132413 its reverse (314231132), we get a palindrome (545363545).

The spelling of 231132413 in words is "two hundred thirty-one million, one hundred thirty-two thousand, four hundred thirteen".