561287955 has 16 divisors (see below), whose sum is σ = 900011520. Its totient is φ = 298703328.

The previous prime is 561287899. The next prime is 561287983. The reversal of 561287955 is 559782165.

It is a happy number.

It is not a de Polignac number, because 561287955 - 2⁹ = 561287443 is a prime.

It is an unprimeable number.

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, 33465 + ... + 47354.

It is an arithmetic number, because the mean of its divisors is an integer number (56250720).

Almost surely, 2^561287955 is an apocalyptic number.

561287955 is a deficient number, since it is larger than the sum of its proper divisors (338723565).

561287955 is a wasteful number, since it uses less digits than its factorization.

561287955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81290.

The product of its digits is 756000, while the sum is 48.

The square root of 561287955 is about 23691.5165196321. The cubic root of 561287955 is about 824.8884844679. Note that the first 3 decimals are identical.

The spelling of 561287955 in words is "five hundred sixty-one million, two hundred eighty-seven thousand, nine hundred fifty-five".