1561112736 has 48 divisors (see below), whose sum is σ = 4105168704. Its totient is φ = 519450624.

The previous prime is 1561112723. The next prime is 1561112809. The reversal of 1561112736 is 6372111651.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 1561112697 and 1561112706.

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, 41301 + ... + 69483.

It is an arithmetic number, because the mean of its divisors is an integer number (85524348).

Almost surely, 2^1561112736 is an apocalyptic number.

1561112736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1561112736 is an abundant number, since it is smaller than the sum of its proper divisors (2544055968).

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

1561112736 is a wasteful number, since it uses less digits than its factorization.

1561112736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28773 (or 28765 counting only the distinct ones).

The product of its digits is 7560, while the sum is 33.

The square root of 1561112736 is about 39510.9191996339. The cubic root of 1561112736 is about 1160.0536875667.

The spelling of 1561112736 in words is "one billion, five hundred sixty-one million, one hundred twelve thousand, seven hundred thirty-six".