72919121 has 8 divisors (see below), whose sum is σ = 80056704. Its totient is φ = 65866320.

The previous prime is 72919111. The next prime is 72919123. The reversal of 72919121 is 12191927.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72919121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72919123) 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, 19385 + ... + 22838.

It is an arithmetic number, because the mean of its divisors is an integer number (10007088).

Almost surely, 2^72919121 is an apocalyptic number.

It is an amenable number.

72919121 is a deficient number, since it is larger than the sum of its proper divisors (7137583).

72919121 is a wasteful number, since it uses less digits than its factorization.

72919121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42391.

The product of its digits is 2268, while the sum is 32.

The square root of 72919121 is about 8539.2693481351. The cubic root of 72919121 is about 417.7795152151.

The spelling of 72919121 in words is "seventy-two million, nine hundred nineteen thousand, one hundred twenty-one".