129895057 has 4 divisors (see below), whose sum is σ = 130088740. Its totient is φ = 129701376.

The previous prime is 129895037. The next prime is 129895069. The reversal of 129895057 is 750598921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 750598921 = 73 ⋅10282177.

It can be written as a sum of positive squares in 2 ways, for example, as 21818241 + 108076816 = 4671^2 + 10396^2 .

It is a cyclic number.

It is not a de Polignac number, because 129895057 - 2¹⁵ = 129862289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129894998 and 129895016.

It is not an unprimeable number, because it can be changed into a prime (129895027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95832 + ... + 97177.

It is an arithmetic number, because the mean of its divisors is an integer number (32522185).

Almost surely, 2^129895057 is an apocalyptic number.

It is an amenable number.

129895057 is a deficient number, since it is larger than the sum of its proper divisors (193683).

129895057 is an equidigital number, since it uses as much as digits as its factorization.

129895057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193682.

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

The square root of 129895057 is about 11397.1512668737. The cubic root of 129895057 is about 506.4433524097.

The spelling of 129895057 in words is "one hundred twenty-nine million, eight hundred ninety-five thousand, fifty-seven".