72910121 has 4 divisors (see below), whose sum is σ = 73591632. Its totient is φ = 72228612.

The previous prime is 72910099. The next prime is 72910151. The reversal of 72910121 is 12101927.

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 72910121 - 2¹⁸ = 72647977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72910151) 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, 340595 + ... + 340808.

It is an arithmetic number, because the mean of its divisors is an integer number (18397908).

Almost surely, 2^72910121 is an apocalyptic number.

It is an amenable number.

72910121 is a deficient number, since it is larger than the sum of its proper divisors (681511).

72910121 is a wasteful number, since it uses less digits than its factorization.

72910121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681510.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 72910121 is about 8538.7423547031. The cubic root of 72910121 is about 417.7623264436.

The spelling of 72910121 in words is "seventy-two million, nine hundred ten thousand, one hundred twenty-one".