40572509 has 2 divisors, whose sum is σ = 40572510. Its totient is φ = 40572508.

The previous prime is 40572473. The next prime is 40572517. The reversal of 40572509 is 90527504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24970009 + 15602500 = 4997^2 + 3950^2 .

It is a cyclic number.

It is not a de Polignac number, because 40572509 - 2¹² = 40568413 is a prime.

It is a super-2 number, since 2×40572509² = 3292256973110162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40572569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20286254 + 20286255.

It is an arithmetic number, because the mean of its divisors is an integer number (20286255).

Almost surely, 2^40572509 is an apocalyptic number.

It is an amenable number.

40572509 is a deficient number, since it is larger than the sum of its proper divisors (1).

40572509 is an equidigital number, since it uses as much as digits as its factorization.

40572509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 40572509 is about 6369.6553281948. The cubic root of 40572509 is about 343.6190940008.

The spelling of 40572509 in words is "forty million, five hundred seventy-two thousand, five hundred nine".