133031831 has 2 divisors, whose sum is σ = 133031832. Its totient is φ = 133031830.

The previous prime is 133031827. The next prime is 133031867. The reversal of 133031831 is 138130331.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 133031831 - 2² = 133031827 is a prime.

It is a super-2 number, since 2×133031831² = 35394936118425122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 133031797 and 133031806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133031531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66515915 + 66515916.

It is an arithmetic number, because the mean of its divisors is an integer number (66515916).

Almost surely, 2^133031831 is an apocalyptic number.

133031831 is a deficient number, since it is larger than the sum of its proper divisors (1).

133031831 is an equidigital number, since it uses as much as digits as its factorization.

133031831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 133031831 is about 11533.9425609806. The cubic root of 133031831 is about 510.4875908426.

The spelling of 133031831 in words is "one hundred thirty-three million, thirty-one thousand, eight hundred thirty-one".