131230905 has 64 divisors (see below), whose sum is σ = 247339008. Its totient is φ = 58798080.

The previous prime is 131230901. The next prime is 131230907. The reversal of 131230905 is 509032131.

It is a happy number.

It is not a de Polignac number, because 131230905 - 2² = 131230901 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131230901) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 102127 + ... + 103403.

It is an arithmetic number, because the mean of its divisors is an integer number (3864672).

Almost surely, 2^131230905 is an apocalyptic number.

131230905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131230905 is a deficient number, since it is larger than the sum of its proper divisors (116108103).

131230905 is a wasteful number, since it uses less digits than its factorization.

131230905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 131230905 is about 11455.6058329536. The cubic root of 131230905 is about 508.1735320205.

The spelling of 131230905 in words is "one hundred thirty-one million, two hundred thirty thousand, nine hundred five".