133947857 has 2 divisors, whose sum is σ = 133947858. Its totient is φ = 133947856.

The previous prime is 133947851. The next prime is 133947901. The reversal of 133947857 is 758749331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77457601 + 56490256 = 8801^2 + 7516^2 .

It is a cyclic number.

It is not a de Polignac number, because 133947857 - 2⁴ = 133947841 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133947851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66973928 + 66973929.

It is an arithmetic number, because the mean of its divisors is an integer number (66973929).

Almost surely, 2^133947857 is an apocalyptic number.

It is an amenable number.

133947857 is a deficient number, since it is larger than the sum of its proper divisors (1).

133947857 is an equidigital number, since it uses as much as digits as its factorization.

133947857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 47.

The square root of 133947857 is about 11573.5844490806. The cubic root of 133947857 is about 511.6566110249.

The spelling of 133947857 in words is "one hundred thirty-three million, nine hundred forty-seven thousand, eight hundred fifty-seven".