125135005121 has 4 divisors (see below), whose sum is σ = 143011434432. Its totient is φ = 107258575812.

The previous prime is 125135005111. The next prime is 125135005159. The reversal of 125135005121 is 121500531521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 125135005121 - 2²⁶ = 125067896257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125135005111) 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, 8938214645 + ... + 8938214658.

It is an arithmetic number, because the mean of its divisors is an integer number (35752858608).

Almost surely, 2^125135005121 is an apocalyptic number.

It is an amenable number.

125135005121 is a deficient number, since it is larger than the sum of its proper divisors (17876429311).

125135005121 is an equidigital number, since it uses as much as digits as its factorization.

125135005121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17876429310.

The product of its (nonzero) digits is 1500, while the sum is 26.

Adding to 125135005121 its reverse (121500531521), we get a palindrome (246635536642).

The spelling of 125135005121 in words is "one hundred twenty-five billion, one hundred thirty-five million, five thousand, one hundred twenty-one".