72176121 has 12 divisors (see below), whose sum is σ = 105017172. Its totient is φ = 47765376.

The previous prime is 72176081. The next prime is 72176123. The reversal of 72176121 is 12167127.

It can be written as a sum of positive squares in 2 ways, for example, as 33872400 + 38303721 = 5820^2 + 6189^2 .

It is not a de Polignac number, because 72176121 - 2¹⁰ = 72175097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72176123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28036 + ... + 30501.

It is an arithmetic number, because the mean of its divisors is an integer number (8751431).

Almost surely, 2^72176121 is an apocalyptic number.

It is an amenable number.

72176121 is a deficient number, since it is larger than the sum of its proper divisors (32841051).

72176121 is a wasteful number, since it uses less digits than its factorization.

72176121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58680 (or 58677 counting only the distinct ones).

The product of its digits is 1176, while the sum is 27.

The square root of 72176121 is about 8495.6530649503. The cubic root of 72176121 is about 416.3556980720.

The spelling of 72176121 in words is "seventy-two million, one hundred seventy-six thousand, one hundred twenty-one".