133251931 has 2 divisors, whose sum is σ = 133251932. Its totient is φ = 133251930.

The previous prime is 133251893. The next prime is 133251947. The reversal of 133251931 is 139152331.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133251931 is a prime.

It is a super-2 number, since 2×133251931² = 35512154230457522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 133251931.

It is not a weakly prime, because it can be changed into another prime (133251971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66625965 + 66625966.

It is an arithmetic number, because the mean of its divisors is an integer number (66625966).

Almost surely, 2^133251931 is an apocalyptic number.

133251931 is a deficient number, since it is larger than the sum of its proper divisors (1).

133251931 is an equidigital number, since it uses as much as digits as its factorization.

133251931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2430, while the sum is 28.

The square root of 133251931 is about 11543.4800212068. The cubic root of 133251931 is about 510.7689681378.

The spelling of 133251931 in words is "one hundred thirty-three million, two hundred fifty-one thousand, nine hundred thirty-one".