72125121 has 8 divisors (see below), whose sum is σ = 101228320. Its totient is φ = 45552672.

The previous prime is 72125069. The next prime is 72125143. The reversal of 72125121 is 12152127.

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

It is not a de Polignac number, because 72125121 - 2⁶ = 72125057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72125161) 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, 632620 + ... + 632733.

It is an arithmetic number, because the mean of its divisors is an integer number (12653540).

Almost surely, 2^72125121 is an apocalyptic number.

It is an amenable number.

72125121 is a deficient number, since it is larger than the sum of its proper divisors (29103199).

72125121 is a wasteful number, since it uses less digits than its factorization.

72125121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265375.

The product of its digits is 280, while the sum is 21.

The square root of 72125121 is about 8492.6509995407. The cubic root of 72125121 is about 416.2576086409.

Adding to 72125121 its reverse (12152127), we get a palindrome (84277248).

The spelling of 72125121 in words is "seventy-two million, one hundred twenty-five thousand, one hundred twenty-one".