564231561 has 16 divisors (see below), whose sum is σ = 790300800. Its totient is φ = 357378560.

The previous prime is 564231553. The next prime is 564231617. The reversal of 564231561 is 165132465.

It is a cyclic number.

It is not a de Polignac number, because 564231561 - 2³ = 564231553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (564231361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17160 + ... + 37721.

It is an arithmetic number, because the mean of its divisors is an integer number (49393800).

Almost surely, 2^564231561 is an apocalyptic number.

It is an amenable number.

564231561 is a deficient number, since it is larger than the sum of its proper divisors (226069239).

564231561 is a wasteful number, since it uses less digits than its factorization.

564231561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55056.

The product of its digits is 21600, while the sum is 33.

The square root of 564231561 is about 23753.5589122978. The cubic root of 564231561 is about 826.3279798812.

The spelling of 564231561 in words is "five hundred sixty-four million, two hundred thirty-one thousand, five hundred sixty-one".