133508831 has 2 divisors, whose sum is σ = 133508832. Its totient is φ = 133508830.

The previous prime is 133508819. The next prime is 133508849. The reversal of 133508831 is 138805331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 133508831 - 2²⁶ = 66399967 is a prime.

It is a super-2 number, since 2×133508831² = 35649215909973122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133508861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66754415 + 66754416.

It is an arithmetic number, because the mean of its divisors is an integer number (66754416).

Almost surely, 2^133508831 is an apocalyptic number.

133508831 is a deficient number, since it is larger than the sum of its proper divisors (1).

133508831 is an equidigital number, since it uses as much as digits as its factorization.

133508831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 133508831 is about 11554.6021567166. The cubic root of 133508831 is about 511.0969991885.

The spelling of 133508831 in words is "one hundred thirty-three million, five hundred eight thousand, eight hundred thirty-one".