125129911 has 4 divisors (see below), whose sum is σ = 132490512. Its totient is φ = 117769312.

The previous prime is 125129899. The next prime is 125129941. The reversal of 125129911 is 119921521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 119921521 = 19 ⋅6311659.

It is a cyclic number.

It is not a de Polignac number, because 125129911 - 2⁷ = 125129783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125129941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3680275 + ... + 3680308.

It is an arithmetic number, because the mean of its divisors is an integer number (33122628).

Almost surely, 2^125129911 is an apocalyptic number.

125129911 is a deficient number, since it is larger than the sum of its proper divisors (7360601).

125129911 is an equidigital number, since it uses as much as digits as its factorization.

125129911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7360600.

The product of its digits is 1620, while the sum is 31.

The square root of 125129911 is about 11186.1481753104. The cubic root of 125129911 is about 500.1731546946.

The spelling of 125129911 in words is "one hundred twenty-five million, one hundred twenty-nine thousand, nine hundred eleven".