561490655 has 8 divisors (see below), whose sum is σ = 735042384. Its totient is φ = 408356800.

The previous prime is 561490627. The next prime is 561490661. The reversal of 561490655 is 556094165.

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

It is not a de Polignac number, because 561490655 - 2¹² = 561486559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5104406 + ... + 5104515.

It is an arithmetic number, because the mean of its divisors is an integer number (91880298).

Almost surely, 2^561490655 is an apocalyptic number.

561490655 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

561490655 is a deficient number, since it is larger than the sum of its proper divisors (173551729).

561490655 is a wasteful number, since it uses less digits than its factorization.

561490655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10208937.

The product of its (nonzero) digits is 162000, while the sum is 41.

The square root of 561490655 is about 23695.7940360732. The cubic root of 561490655 is about 824.9877708625.

It can be divided in two parts, 5614 and 90655, that added together give a palindrome (96269).

The spelling of 561490655 in words is "five hundred sixty-one million, four hundred ninety thousand, six hundred fifty-five".