129857933 has 2 divisors, whose sum is σ = 129857934. Its totient is φ = 129857932.

The previous prime is 129857891. The next prime is 129857941. The reversal of 129857933 is 339758921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105226564 + 24631369 = 10258^2 + 4963^2 .

It is a cyclic number.

It is not a de Polignac number, because 129857933 - 2²⁴ = 113080717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129857953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64928966 + 64928967.

It is an arithmetic number, because the mean of its divisors is an integer number (64928967).

Almost surely, 2^129857933 is an apocalyptic number.

It is an amenable number.

129857933 is a deficient number, since it is larger than the sum of its proper divisors (1).

129857933 is an equidigital number, since it uses as much as digits as its factorization.

129857933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 47.

The square root of 129857933 is about 11395.5224978936. The cubic root of 129857933 is about 506.3951006521.

The spelling of 129857933 in words is "one hundred twenty-nine million, eight hundred fifty-seven thousand, nine hundred thirty-three".