133280931 has 12 divisors (see below), whose sum is σ = 206721672. Its totient is φ = 76160448.

The previous prime is 133280923. The next prime is 133280957. The reversal of 133280931 is 139082331.

It is not a de Polignac number, because 133280931 - 2³ = 133280923 is a prime.

It is a super-2 number, since 2×133280931² = 35527613136453522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133280921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 453190 + ... + 453483.

It is an arithmetic number, because the mean of its divisors is an integer number (17226806).

Almost surely, 2^133280931 is an apocalyptic number.

133280931 is a deficient number, since it is larger than the sum of its proper divisors (73440741).

133280931 is an equidigital number, since it uses as much as digits as its factorization.

133280931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906690 (or 906683 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 133280931 is about 11544.7360732067. The cubic root of 133280931 is about 510.8060188221.

The spelling of 133280931 in words is "one hundred thirty-three million, two hundred eighty thousand, nine hundred thirty-one".