564391261 has 12 divisors (see below), whose sum is σ = 658290720. Its totient is φ = 482471640.

The previous prime is 564391231. The next prime is 564391277. The reversal of 564391261 is 162193465.

It is not a de Polignac number, because 564391261 - 2¹⁵ = 564358493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 564391261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (564391231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3376 + ... + 33766.

It is an arithmetic number, because the mean of its divisors is an integer number (54857560).

Almost surely, 2^564391261 is an apocalyptic number.

It is an amenable number.

564391261 is a deficient number, since it is larger than the sum of its proper divisors (93899459).

564391261 is a wasteful number, since it uses less digits than its factorization.

564391261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30784 (or 30777 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 564391261 is about 23756.9202759954. The cubic root of 564391261 is about 826.4059337681.

The spelling of 564391261 in words is "five hundred sixty-four million, three hundred ninety-one thousand, two hundred sixty-one".