129115057 has 2 divisors, whose sum is σ = 129115058. Its totient is φ = 129115056.

The previous prime is 129115037. The next prime is 129115121. The reversal of 129115057 is 750511921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92621376 + 36493681 = 9624^2 + 6041^2 .

It is an emirp because it is prime and its reverse (750511921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129115057 is a prime.

It is a super-2 number, since 2×129115057² = 33341395888226498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129115037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64557528 + 64557529.

It is an arithmetic number, because the mean of its divisors is an integer number (64557529).

Almost surely, 2^129115057 is an apocalyptic number.

It is an amenable number.

129115057 is a deficient number, since it is larger than the sum of its proper divisors (1).

129115057 is an equidigital number, since it uses as much as digits as its factorization.

129115057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3150, while the sum is 31.

The square root of 129115057 is about 11362.8806646906. The cubic root of 129115057 is about 505.4276115434.

Adding to 129115057 its reverse (750511921), we get a palindrome (879626978).

The spelling of 129115057 in words is "one hundred twenty-nine million, one hundred fifteen thousand, fifty-seven".