133972613 has 2 divisors, whose sum is σ = 133972614. Its totient is φ = 133972612.

The previous prime is 133972589. The next prime is 133972627. The reversal of 133972613 is 316279331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104182849 + 29789764 = 10207^2 + 5458^2 .

It is an emirp because it is prime and its reverse (316279331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133972613 - 2⁶ = 133972549 is a prime.

It is a super-2 number, since 2×133972613² = 35897322068095538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133972633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66986306 + 66986307.

It is an arithmetic number, because the mean of its divisors is an integer number (66986307).

Almost surely, 2^133972613 is an apocalyptic number.

It is an amenable number.

133972613 is a deficient number, since it is larger than the sum of its proper divisors (1).

133972613 is an equidigital number, since it uses as much as digits as its factorization.

133972613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 35.

The square root of 133972613 is about 11574.6539041131. The cubic root of 133972613 is about 511.6881302322.

The spelling of 133972613 in words is "one hundred thirty-three million, nine hundred seventy-two thousand, six hundred thirteen".