133261613 has 2 divisors, whose sum is σ = 133261614. Its totient is φ = 133261612.

The previous prime is 133261567. The next prime is 133261619. The reversal of 133261613 is 316162331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87198244 + 46063369 = 9338^2 + 6787^2 .

It is a cyclic number.

It is not a de Polignac number, because 133261613 - 2⁶ = 133261549 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133261619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66630806 + 66630807.

It is an arithmetic number, because the mean of its divisors is an integer number (66630807).

Almost surely, 2^133261613 is an apocalyptic number.

It is an amenable number.

133261613 is a deficient number, since it is larger than the sum of its proper divisors (1).

133261613 is an equidigital number, since it uses as much as digits as its factorization.

133261613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 26.

The square root of 133261613 is about 11543.8993845234. The cubic root of 133261613 is about 510.7813385536.

The spelling of 133261613 in words is "one hundred thirty-three million, two hundred sixty-one thousand, six hundred thirteen".