561877 has 4 divisors (see below), whose sum is σ = 563776. Its totient is φ = 559980.

The previous prime is 561839. The next prime is 561907. The reversal of 561877 is 778165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 561877 - 2¹⁹ = 37589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561277) 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, 399 + ... + 1132.

It is an arithmetic number, because the mean of its divisors is an integer number (140944).

2⁵⁶¹⁸⁷⁷ is an apocalyptic number.

It is an amenable number.

561877 is a deficient number, since it is larger than the sum of its proper divisors (1899).

561877 is a wasteful number, since it uses less digits than its factorization.

561877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898.

The product of its digits is 11760, while the sum is 34.

The square root of 561877 is about 749.5845516018. The cubic root of 561877 is about 82.5176943987.

The spelling of 561877 in words is "five hundred sixty-one thousand, eight hundred seventy-seven".