571640609 has 2 divisors, whose sum is σ = 571640610. Its totient is φ = 571640608.

The previous prime is 571640591. The next prime is 571640677. The reversal of 571640609 is 906046175.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 439321600 + 132319009 = 20960^2 + 11503^2 .

It is a cyclic number.

It is not a de Polignac number, because 571640609 - 2⁸ = 571640353 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (571642609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 285820304 + 285820305.

It is an arithmetic number, because the mean of its divisors is an integer number (285820305).

Almost surely, 2^571640609 is an apocalyptic number.

It is an amenable number.

571640609 is a deficient number, since it is larger than the sum of its proper divisors (1).

571640609 is an equidigital number, since it uses as much as digits as its factorization.

571640609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 571640609 is about 23909.0068593407. The cubic root of 571640609 is about 829.9291607418.

The spelling of 571640609 in words is "five hundred seventy-one million, six hundred forty thousand, six hundred nine".