133931905 has 16 divisors (see below), whose sum is σ = 166846464. Its totient is φ = 103135680.

The previous prime is 133931869. The next prime is 133931923. The reversal of 133931905 is 509139331.

It is not a de Polignac number, because 133931905 - 2⁹ = 133931393 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, 9664 + ... + 19006.

It is an arithmetic number, because the mean of its divisors is an integer number (10427904).

Almost surely, 2^133931905 is an apocalyptic number.

It is an amenable number.

133931905 is a deficient number, since it is larger than the sum of its proper divisors (32914559).

133931905 is an equidigital number, since it uses as much as digits as its factorization.

133931905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9456.

The product of its (nonzero) digits is 10935, while the sum is 34.

The square root of 133931905 is about 11572.8952730075. The cubic root of 133931905 is about 511.6362989660.

The spelling of 133931905 in words is "one hundred thirty-three million, nine hundred thirty-one thousand, nine hundred five".