73889521 has 2 divisors, whose sum is σ = 73889522. Its totient is φ = 73889520.

The previous prime is 73889513. The next prime is 73889527. The reversal of 73889521 is 12598837.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56791296 + 17098225 = 7536^2 + 4135^2 .

It is an emirp because it is prime and its reverse (12598837) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73889521 - 2³ = 73889513 is a prime.

It is a super-2 number, since 2×73889521² = 10919322627218882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (73889527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36944760 + 36944761.

It is an arithmetic number, because the mean of its divisors is an integer number (36944761).

Almost surely, 2^73889521 is an apocalyptic number.

It is an amenable number.

73889521 is a deficient number, since it is larger than the sum of its proper divisors (1).

73889521 is an equidigital number, since it uses as much as digits as its factorization.

73889521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 73889521 is about 8595.9014070660. The cubic root of 73889521 is about 419.6246097817.

The spelling of 73889521 in words is "seventy-three million, eight hundred eighty-nine thousand, five hundred twenty-one".