131931905 has 16 divisors (see below), whose sum is σ = 181881984. Its totient is φ = 89994240.

The previous prime is 131931881. The next prime is 131931941. The reversal of 131931905 is 509139131.

It is a happy number.

It is not a de Polignac number, because 131931905 - 2¹⁰ = 131930881 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3011 + ... + 16520.

It is an arithmetic number, because the mean of its divisors is an integer number (11367624).

Almost surely, 2^131931905 is an apocalyptic number.

It is an amenable number.

131931905 is a deficient number, since it is larger than the sum of its proper divisors (49950079).

131931905 is a wasteful number, since it uses less digits than its factorization.

131931905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19736.

The product of its (nonzero) digits is 3645, while the sum is 32.

The square root of 131931905 is about 11486.1614562917. The cubic root of 131931905 is about 509.0767674981.

The spelling of 131931905 in words is "one hundred thirty-one million, nine hundred thirty-one thousand, nine hundred five".