561872887 has 2 divisors, whose sum is σ = 561872888. Its totient is φ = 561872886.

The previous prime is 561872881. The next prime is 561872903. The reversal of 561872887 is 788278165.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561872887 - 2³ = 561872879 is a prime.

It is a super-2 number, since 2×561872887² = 631402282291429538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561872881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280936443 + 280936444.

It is an arithmetic number, because the mean of its divisors is an integer number (280936444).

Almost surely, 2^561872887 is an apocalyptic number.

561872887 is a deficient number, since it is larger than the sum of its proper divisors (1).

561872887 is an equidigital number, since it uses as much as digits as its factorization.

561872887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1505280, while the sum is 52.

The square root of 561872887 is about 23703.8580615055. The cubic root of 561872887 is about 825.1749305212.

The spelling of 561872887 in words is "five hundred sixty-one million, eight hundred seventy-two thousand, eight hundred eighty-seven".