72654521 has 2 divisors, whose sum is σ = 72654522. Its totient is φ = 72654520.

The previous prime is 72654509. The next prime is 72654551. The reversal of 72654521 is 12545627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48497296 + 24157225 = 6964^2 + 4915^2 .

It is a cyclic number.

It is not a de Polignac number, because 72654521 - 2¹⁸ = 72392377 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72654551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36327260 + 36327261.

It is an arithmetic number, because the mean of its divisors is an integer number (36327261).

Almost surely, 2^72654521 is an apocalyptic number.

It is an amenable number.

72654521 is a deficient number, since it is larger than the sum of its proper divisors (1).

72654521 is an equidigital number, since it uses as much as digits as its factorization.

72654521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 32.

The square root of 72654521 is about 8523.7621388680. The cubic root of 72654521 is about 417.2735736619.

The spelling of 72654521 in words is "seventy-two million, six hundred fifty-four thousand, five hundred twenty-one".