72557501 has 2 divisors, whose sum is σ = 72557502. Its totient is φ = 72557500.

The previous prime is 72557497. The next prime is 72557509. The reversal of 72557501 is 10575527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59059225 + 13498276 = 7685^2 + 3674^2 .

It is a cyclic number.

It is not a de Polignac number, because 72557501 - 2² = 72557497 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72557509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36278750 + 36278751.

It is an arithmetic number, because the mean of its divisors is an integer number (36278751).

Almost surely, 2^72557501 is an apocalyptic number.

It is an amenable number.

72557501 is a deficient number, since it is larger than the sum of its proper divisors (1).

72557501 is an equidigital number, since it uses as much as digits as its factorization.

72557501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12250, while the sum is 32.

The square root of 72557501 is about 8518.0690887078. The cubic root of 72557501 is about 417.0877539995.

The spelling of 72557501 in words is "seventy-two million, five hundred fifty-seven thousand, five hundred one".