72914521 has 3 divisors (see below), whose sum is σ = 72923061. Its totient is φ = 72905982.

The previous prime is 72914519. The next prime is 72914537. The reversal of 72914521 is 12541927.

The square root of 72914521 is 8539.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 72914521 - 2¹ = 72914519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72914561) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4270 + ... + 12808.

It is an arithmetic number, because the mean of its divisors is an integer number (24307687).

Almost surely, 2^72914521 is an apocalyptic number.

72914521 is the 8539-th square number.

72914521 is the 4270-th centered octagonal number.

It is an amenable number.

72914521 is a deficient number, since it is larger than the sum of its proper divisors (8540).

72914521 is an frugal number, since it uses more digits than its factorization.

72914521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17078 (or 8539 counting only the distinct ones).

The product of its digits is 5040, while the sum is 31.

The cubic root of 72914521 is about 417.7707300197.

The spelling of 72914521 in words is "seventy-two million, nine hundred fourteen thousand, five hundred twenty-one".