561634769 has 16 divisors (see below), whose sum is σ = 602066304. Its totient is φ = 522614400.

The previous prime is 561634751. The next prime is 561634783. The reversal of 561634769 is 967436165.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561634769 is a prime.

It is a super-2 number, since 2×561634769² = 630867227499366722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (561634169) 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 15 ways as a sum of consecutive naturals, for example, 462407 + ... + 463619.

It is an arithmetic number, because the mean of its divisors is an integer number (37629144).

Almost surely, 2^561634769 is an apocalyptic number.

It is an amenable number.

561634769 is a deficient number, since it is larger than the sum of its proper divisors (40431535).

561634769 is a wasteful number, since it uses less digits than its factorization.

561634769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768.

The product of its digits is 816480, while the sum is 47.

The square root of 561634769 is about 23698.8347603843. The cubic root of 561634769 is about 825.0583461643.

The spelling of 561634769 in words is "five hundred sixty-one million, six hundred thirty-four thousand, seven hundred sixty-nine".