1561316156 has 24 divisors (see below), whose sum is σ = 2759909376. Its totient is φ = 772798320.

The previous prime is 1561316143. The next prime is 1561316161. The reversal of 1561316156 is 6516131651.

It is a congruent number.

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, 244241 + ... + 250551.

It is an arithmetic number, because the mean of its divisors is an integer number (114996224).

Almost surely, 2^1561316156 is an apocalyptic number.

It is an amenable number.

1561316156 is a deficient number, since it is larger than the sum of its proper divisors (1198593220).

1561316156 is a wasteful number, since it uses less digits than its factorization.

1561316156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6929 (or 6927 counting only the distinct ones).

The product of its digits is 16200, while the sum is 35.

The square root of 1561316156 is about 39513.4933408829. The cubic root of 1561316156 is about 1160.1040721133.

The spelling of 1561316156 in words is "one billion, five hundred sixty-one million, three hundred sixteen thousand, one hundred fifty-six".