561955 has 8 divisors (see below), whose sum is σ = 679392. Its totient is φ = 446208.

The previous prime is 561947. The next prime is 561961. The reversal of 561955 is 559165.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561955 - 2³ = 561947 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499 + ... + 1171.

It is an arithmetic number, because the mean of its divisors is an integer number (84924).

2⁵⁶¹⁹⁵⁵ is an apocalyptic number.

561955 is a deficient number, since it is larger than the sum of its proper divisors (117437).

561955 is a wasteful number, since it uses less digits than its factorization.

561955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845.

The product of its digits is 6750, while the sum is 31.

The square root of 561955 is about 749.6365786166. The cubic root of 561955 is about 82.5215126023.

The spelling of 561955 in words is "five hundred sixty-one thousand, nine hundred fifty-five".