72591569 has 2 divisors, whose sum is σ = 72591570. Its totient is φ = 72591568.

The previous prime is 72591559. The next prime is 72591577. The reversal of 72591569 is 96519527.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68690944 + 3900625 = 8288^2 + 1975^2 .

It is a cyclic number.

It is not a de Polignac number, because 72591569 - 2¹⁶ = 72526033 is a prime.

It is a super-2 number, since 2×72591569² = 10539071779763522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72591509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36295784 + 36295785.

It is an arithmetic number, because the mean of its divisors is an integer number (36295785).

Almost surely, 2^72591569 is an apocalyptic number.

It is an amenable number.

72591569 is a deficient number, since it is larger than the sum of its proper divisors (1).

72591569 is an equidigital number, since it uses as much as digits as its factorization.

72591569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170100, while the sum is 44.

The square root of 72591569 is about 8520.0686030102. The cubic root of 72591569 is about 417.1530223365.

The spelling of 72591569 in words is "seventy-two million, five hundred ninety-one thousand, five hundred sixty-nine".