72575509 has 2 divisors, whose sum is σ = 72575510. Its totient is φ = 72575508.

The previous prime is 72575471. The next prime is 72575513. The reversal of 72575509 is 90557527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65658609 + 6916900 = 8103^2 + 2630^2 .

It is a cyclic number.

It is not a de Polignac number, because 72575509 - 2¹³ = 72567317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72575549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36287754 + 36287755.

It is an arithmetic number, because the mean of its divisors is an integer number (36287755).

Almost surely, 2^72575509 is an apocalyptic number.

It is an amenable number.

72575509 is a deficient number, since it is larger than the sum of its proper divisors (1).

72575509 is an equidigital number, since it uses as much as digits as its factorization.

72575509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110250, while the sum is 40.

The square root of 72575509 is about 8519.1260702023. The cubic root of 72575509 is about 417.1222567267.

The spelling of 72575509 in words is "seventy-two million, five hundred seventy-five thousand, five hundred nine".