133621757 has 2 divisors, whose sum is σ = 133621758. Its totient is φ = 133621756.

The previous prime is 133621739. The next prime is 133621759. The reversal of 133621757 is 757126331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118613881 + 15007876 = 10891^2 + 3874^2 .

It is a cyclic number.

It is not a de Polignac number, because 133621757 - 2²² = 129427453 is a prime.

Together with 133621759, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133621759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66810878 + 66810879.

It is an arithmetic number, because the mean of its divisors is an integer number (66810879).

Almost surely, 2^133621757 is an apocalyptic number.

It is an amenable number.

133621757 is a deficient number, since it is larger than the sum of its proper divisors (1).

133621757 is an equidigital number, since it uses as much as digits as its factorization.

133621757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26460, while the sum is 35.

The square root of 133621757 is about 11559.4877481660. The cubic root of 133621757 is about 511.2410592586.

The spelling of 133621757 in words is "one hundred thirty-three million, six hundred twenty-one thousand, seven hundred fifty-seven".