131613231 has 4 divisors (see below), whose sum is σ = 175484312. Its totient is φ = 87742152.

The previous prime is 131613217. The next prime is 131613253. The reversal of 131613231 is 132316131.

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

It is not a de Polignac number, because 131613231 - 2¹⁷ = 131482159 is a prime.

It is a super-2 number, since 2×131613231² = 34644085148518722, 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 = 131613198 and 131613207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131613331) 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, 21935536 + ... + 21935541.

It is an arithmetic number, because the mean of its divisors is an integer number (43871078).

Almost surely, 2^131613231 is an apocalyptic number.

131613231 is a deficient number, since it is larger than the sum of its proper divisors (43871081).

131613231 is an equidigital number, since it uses as much as digits as its factorization.

131613231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43871080.

The product of its digits is 324, while the sum is 21.

The square root of 131613231 is about 11472.2809850526. The cubic root of 131613231 is about 508.6665550629. Note that the first 3 decimals are identical.

Adding to 131613231 its reverse (132316131), we get a palindrome (263929362).

The spelling of 131613231 in words is "one hundred thirty-one million, six hundred thirteen thousand, two hundred thirty-one".