1561796159 has 48 divisors (see below), whose sum is σ = 2066052096. Its totient is φ = 1166356800.

The previous prime is 1561796147. The next prime is 1561796177. The reversal of 1561796159 is 9516971651.

It is a de Polignac number, because none of the positive numbers 2^k-1561796159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561796059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1415402 + ... + 1416504.

It is an arithmetic number, because the mean of its divisors is an integer number (43042752).

Almost surely, 2^1561796159 is an apocalyptic number.

1561796159 is a deficient number, since it is larger than the sum of its proper divisors (504255937).

1561796159 is a wasteful number, since it uses less digits than its factorization.

1561796159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236 (or 1229 counting only the distinct ones).

The product of its digits is 510300, while the sum is 50.

The square root of 1561796159 is about 39519.5667865932. The cubic root of 1561796159 is about 1160.2229454064. Note that the first 3 decimals are identical.

The spelling of 1561796159 in words is "one billion, five hundred sixty-one million, seven hundred ninety-six thousand, one hundred fifty-nine".