125122509 has 16 divisors (see below), whose sum is σ = 185785600. Its totient is φ = 83226528.

The previous prime is 125122471. The next prime is 125122573. The reversal of 125122509 is 905221521.

It is not a de Polignac number, because 125122509 - 2¹¹ = 125120461 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125122589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7497 + ... + 17505.

It is an arithmetic number, because the mean of its divisors is an integer number (11611600).

Almost surely, 2^125122509 is an apocalyptic number.

It is an amenable number.

125122509 is a deficient number, since it is larger than the sum of its proper divisors (60663091).

125122509 is a wasteful number, since it uses less digits than its factorization.

125122509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10481 (or 10475 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 125122509 is about 11185.8173147964. The cubic root of 125122509 is about 500.1632919990.

The spelling of 125122509 in words is "one hundred twenty-five million, one hundred twenty-two thousand, five hundred nine".