133513657 has 2 divisors, whose sum is σ = 133513658. Its totient is φ = 133513656.

The previous prime is 133513607. The next prime is 133513663. The reversal of 133513657 is 756315331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89038096 + 44475561 = 9436^2 + 6669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133513657 is a prime.

It is not a weakly prime, because it can be changed into another prime (133513607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66756828 + 66756829.

It is an arithmetic number, because the mean of its divisors is an integer number (66756829).

Almost surely, 2^133513657 is an apocalyptic number.

It is an amenable number.

133513657 is a deficient number, since it is larger than the sum of its proper divisors (1).

133513657 is an equidigital number, since it uses as much as digits as its factorization.

133513657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28350, while the sum is 34.

The square root of 133513657 is about 11554.8109893672. The cubic root of 133513657 is about 511.1031573939.

Adding to 133513657 its reverse (756315331), we get a palindrome (889828988).

The spelling of 133513657 in words is "one hundred thirty-three million, five hundred thirteen thousand, six hundred fifty-seven".