125215409 has 8 divisors (see below), whose sum is σ = 136683552. Its totient is φ = 113761440.

The previous prime is 125215403. The next prime is 125215423. The reversal of 125215409 is 904512521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 125215409 - 2⁴ = 125215393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125215403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24902 + ... + 29504.

It is an arithmetic number, because the mean of its divisors is an integer number (17085444).

Almost surely, 2^125215409 is an apocalyptic number.

It is an amenable number.

125215409 is a deficient number, since it is larger than the sum of its proper divisors (11468143).

125215409 is a wasteful number, since it uses less digits than its factorization.

125215409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7087.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 125215409 is about 11189.9691241755. The cubic root of 125215409 is about 500.2870471763.

It can be divided in two parts, 1252 and 15409, that added together give a palindrome (16661).

The spelling of 125215409 in words is "one hundred twenty-five million, two hundred fifteen thousand, four hundred nine".