125128291 has 2 divisors, whose sum is σ = 125128292. Its totient is φ = 125128290.

The previous prime is 125128277. The next prime is 125128327. The reversal of 125128291 is 192821521.

It is a weak prime.

It is an emirp because it is prime and its reverse (192821521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125128291 - 2⁷ = 125128163 is a prime.

It is a pancake number, because a pancake can be divided into 125128291 parts by 15819 straight cuts.

It is not a weakly prime, because it can be changed into another prime (125128271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62564145 + 62564146.

It is an arithmetic number, because the mean of its divisors is an integer number (62564146).

Almost surely, 2^125128291 is an apocalyptic number.

125128291 is a deficient number, since it is larger than the sum of its proper divisors (1).

125128291 is an equidigital number, since it uses as much as digits as its factorization.

125128291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 31.

The square root of 125128291 is about 11186.0757640917. The cubic root of 125128291 is about 500.1709961806.

The spelling of 125128291 in words is "one hundred twenty-five million, one hundred twenty-eight thousand, two hundred ninety-one".