131403231 has 6 divisors (see below), whose sum is σ = 189804680. Its totient is φ = 87602148.

The previous prime is 131403143. The next prime is 131403253. The reversal of 131403231 is 132304131.

131403231 is a `hidden beast` number, since 1 + 31 + 403 + 231 = 666.

It is not a de Polignac number, because 131403231 - 2¹¹ = 131401183 is a prime.

It is a super-2 number, since 2×131403231² = 34533618234478722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131403131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7300171 + ... + 7300188.

Almost surely, 2^131403231 is an apocalyptic number.

131403231 is a deficient number, since it is larger than the sum of its proper divisors (58401449).

131403231 is a wasteful number, since it uses less digits than its factorization.

131403231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14600365 (or 14600362 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 131403231 is about 11463.1248357505. The cubic root of 131403231 is about 508.3958709288.

Adding to 131403231 its reverse (132304131), we get a palindrome (263707362).

The spelling of 131403231 in words is "one hundred thirty-one million, four hundred three thousand, two hundred thirty-one".