72521023 has 2 divisors, whose sum is σ = 72521024. Its totient is φ = 72521022.

The previous prime is 72521021. The next prime is 72521051. The reversal of 72521023 is 32012527.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72521023 - 2¹ = 72521021 is a prime.

Together with 72521021, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 72520985 and 72521003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72521021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36260511 + 36260512.

It is an arithmetic number, because the mean of its divisors is an integer number (36260512).

Almost surely, 2^72521023 is an apocalyptic number.

72521023 is a deficient number, since it is larger than the sum of its proper divisors (1).

72521023 is an equidigital number, since it uses as much as digits as its factorization.

72521023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 72521023 is about 8515.9276065500. The cubic root of 72521023 is about 417.0178458702.

The spelling of 72521023 in words is "seventy-two million, five hundred twenty-one thousand, twenty-three".