1561936512 has 32 divisors (see below), whose sum is σ = 4148894880. Its totient is φ = 520645376.

The previous prime is 1561936427. The next prime is 1561936513. The reversal of 1561936512 is 2156391651.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-3 number, since 3×1561936512³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1561936513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2033388 + ... + 2034155.

It is an arithmetic number, because the mean of its divisors is an integer number (129652965).

Almost surely, 2^1561936512 is an apocalyptic number.

1561936512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1561936512 is an abundant number, since it is smaller than the sum of its proper divisors (2586958368).

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

1561936512 is an equidigital number, since it uses as much as digits as its factorization.

1561936512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4067560 (or 4067548 counting only the distinct ones).

The product of its digits is 48600, while the sum is 39.

The square root of 1561936512 is about 39521.3424873194. The cubic root of 1561936512 is about 1160.2576993856.

The spelling of 1561936512 in words is "one billion, five hundred sixty-one million, nine hundred thirty-six thousand, five hundred twelve".