561464887 has 4 divisors (see below), whose sum is σ = 561650320. Its totient is φ = 561279456.

The previous prime is 561464861. The next prime is 561464903. The reversal of 561464887 is 788464165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561464887 - 2¹⁵ = 561432119 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 561464887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561464807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88098 + ... + 94255.

It is an arithmetic number, because the mean of its divisors is an integer number (140412580).

Almost surely, 2^561464887 is an apocalyptic number.

561464887 is a deficient number, since it is larger than the sum of its proper divisors (185433).

561464887 is a wasteful number, since it uses less digits than its factorization.

561464887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185432.

The product of its digits is 1290240, while the sum is 49.

The square root of 561464887 is about 23695.2503046497. The cubic root of 561464887 is about 824.9751505218.

The spelling of 561464887 in words is "five hundred sixty-one million, four hundred sixty-four thousand, eight hundred eighty-seven".