1561998792 has 16 divisors (see below), whose sum is σ = 3904997040. Its totient is φ = 520666256.

The previous prime is 1561998791. The next prime is 1561998847. The reversal of 1561998792 is 2978991651.

It is not an unprimeable number, because it can be changed into a prime (1561998791) 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, 32541618 + ... + 32541665.

It is an arithmetic number, because the mean of its divisors is an integer number (244062315).

Almost surely, 2^1561998792 is an apocalyptic number.

1561998792 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1561998792 is an abundant number, since it is smaller than the sum of its proper divisors (2342998248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561998792 is a wasteful number, since it uses less digits than its factorization.

1561998792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65083292 (or 65083288 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 57.

The square root of 1561998792 is about 39522.1304081650. The cubic root of 1561998792 is about 1160.2731203899.

It can be divided in two parts, 15619 and 98792, that added together give a palindrome (114411).

The spelling of 1561998792 in words is "one billion, five hundred sixty-one million, nine hundred ninety-eight thousand, seven hundred ninety-two".