561505615 has 16 divisors (see below), whose sum is σ = 735797376. Its totient is φ = 407959200.

The previous prime is 561505577. The next prime is 561505639. The reversal of 561505615 is 516505165.

It is not a de Polignac number, because 561505615 - 2¹¹ = 561503567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57220 + ... + 66310.

It is an arithmetic number, because the mean of its divisors is an integer number (45987336).

Almost surely, 2^561505615 is an apocalyptic number.

561505615 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

561505615 is a deficient number, since it is larger than the sum of its proper divisors (174291761).

561505615 is a wasteful number, since it uses less digits than its factorization.

561505615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10230.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 561505615 is about 23696.1097018055. The cubic root of 561505615 is about 824.9950976140.

The spelling of 561505615 in words is "five hundred sixty-one million, five hundred five thousand, six hundred fifteen".