131023905 has 32 divisors (see below), whose sum is σ = 226074240. Its totient is φ = 64581120.

The previous prime is 131023901. The next prime is 131023969. The reversal of 131023905 is 509320131.

It is a happy number.

It is not a de Polignac number, because 131023905 - 2² = 131023901 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131023901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6079 + ... + 17291.

It is an arithmetic number, because the mean of its divisors is an integer number (7064820).

Almost surely, 2^131023905 is an apocalyptic number.

131023905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131023905 is a deficient number, since it is larger than the sum of its proper divisors (95050335).

131023905 is a wasteful number, since it uses less digits than its factorization.

131023905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11281.

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

The square root of 131023905 is about 11446.5673893967. The cubic root of 131023905 is about 507.9061984515.

The spelling of 131023905 in words is "one hundred thirty-one million, twenty-three thousand, nine hundred five".