129985057 has 2 divisors, whose sum is σ = 129985058. Its totient is φ = 129985056.

The previous prime is 129985019. The next prime is 129985091. The reversal of 129985057 is 750589921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129140496 + 844561 = 11364^2 + 919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129985057 is a prime.

It is a super-2 number, since 2×129985057² = 33792230086586498, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129984998 and 129985016.

It is not a weakly prime, because it can be changed into another prime (129985957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64992528 + 64992529.

It is an arithmetic number, because the mean of its divisors is an integer number (64992529).

Almost surely, 2^129985057 is an apocalyptic number.

It is an amenable number.

129985057 is a deficient number, since it is larger than the sum of its proper divisors (1).

129985057 is an equidigital number, since it uses as much as digits as its factorization.

129985057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 46.

The square root of 129985057 is about 11401.0989382603. The cubic root of 129985057 is about 506.5602913702.

The spelling of 129985057 in words is "one hundred twenty-nine million, nine hundred eighty-five thousand, fifty-seven".