133617857 has 2 divisors, whose sum is σ = 133617858. Its totient is φ = 133617856.

The previous prime is 133617839. The next prime is 133617863. The reversal of 133617857 is 758716331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128346241 + 5271616 = 11329^2 + 2296^2 .

It is a cyclic number.

It is not a de Polignac number, because 133617857 - 2²⁴ = 116840641 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133610857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66808928 + 66808929.

It is an arithmetic number, because the mean of its divisors is an integer number (66808929).

Almost surely, 2^133617857 is an apocalyptic number.

It is an amenable number.

133617857 is a deficient number, since it is larger than the sum of its proper divisors (1).

133617857 is an equidigital number, since it uses as much as digits as its factorization.

133617857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 41.

The square root of 133617857 is about 11559.3190543388. The cubic root of 133617857 is about 511.2360853692.

The spelling of 133617857 in words is "one hundred thirty-three million, six hundred seventeen thousand, eight hundred fifty-seven".