561977857 has 16 divisors (see below), whose sum is σ = 696632832. Its totient is φ = 442298880.

The previous prime is 561977831. The next prime is 561977869. The reversal of 561977857 is 758779165.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 561977857 - 2⁷ = 561977729 is a prime.

It is a super-2 number, since 2×561977857² = 631638223516624898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 561977798 and 561977807.

It is not an unprimeable number, because it can be changed into a prime (561977887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52713 + ... + 62470.

It is an arithmetic number, because the mean of its divisors is an integer number (43539552).

Almost surely, 2^561977857 is an apocalyptic number.

It is an amenable number.

561977857 is a deficient number, since it is larger than the sum of its proper divisors (134654975).

561977857 is a wasteful number, since it uses less digits than its factorization.

561977857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115248.

The product of its digits is 3704400, while the sum is 55.

The square root of 561977857 is about 23706.0721546190. The cubic root of 561977857 is about 825.2263141591.

The spelling of 561977857 in words is "five hundred sixty-one million, nine hundred seventy-seven thousand, eight hundred fifty-seven".