1561333072 has 40 divisors (see below), whose sum is σ = 3264791040. Its totient is φ = 719064960.

The previous prime is 1561333061. The next prime is 1561333087. The reversal of 1561333072 is 2703331651.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 91797 + ... + 107467.

It is an arithmetic number, because the mean of its divisors is an integer number (81619776).

Almost surely, 2^1561333072 is an apocalyptic number.

It is an amenable number.

1561333072 is an abundant number, since it is smaller than the sum of its proper divisors (1703457968).

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

1561333072 is a wasteful number, since it uses less digits than its factorization.

1561333072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16171 (or 16165 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 31.

The square root of 1561333072 is about 39513.7073937640. The cubic root of 1561333072 is about 1160.1082617942.

The spelling of 1561333072 in words is "one billion, five hundred sixty-one million, three hundred thirty-three thousand, seventy-two".