40599509 has 2 divisors, whose sum is σ = 40599510. Its totient is φ = 40599508.

The previous prime is 40599497. The next prime is 40599511. The reversal of 40599509 is 90599504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22562500 + 18037009 = 4750^2 + 4247^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40599509 is a prime.

Together with 40599511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40599529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20299754 + 20299755.

It is an arithmetic number, because the mean of its divisors is an integer number (20299755).

Almost surely, 2^40599509 is an apocalyptic number.

It is an amenable number.

40599509 is a deficient number, since it is larger than the sum of its proper divisors (1).

40599509 is an equidigital number, since it uses as much as digits as its factorization.

40599509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 40599509 is about 6371.7743996472. The cubic root of 40599509 is about 343.6953004313.

The spelling of 40599509 in words is "forty million, five hundred ninety-nine thousand, five hundred nine".