72255509 has 2 divisors, whose sum is σ = 72255510. Its totient is φ = 72255508.

The previous prime is 72255503. The next prime is 72255517. The reversal of 72255509 is 90555227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63123025 + 9132484 = 7945^2 + 3022^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72255509 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 (72255503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36127754 + 36127755.

It is an arithmetic number, because the mean of its divisors is an integer number (36127755).

Almost surely, 2^72255509 is an apocalyptic number.

It is an amenable number.

72255509 is a deficient number, since it is larger than the sum of its proper divisors (1).

72255509 is an equidigital number, since it uses as much as digits as its factorization.

72255509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 72255509 is about 8500.3240526465. The cubic root of 72255509 is about 416.5082948695.

The spelling of 72255509 in words is "seventy-two million, two hundred fifty-five thousand, five hundred nine".