1561359916 has 12 divisors (see below), whose sum is σ = 2769810232. Its totient is φ = 769985568.

The previous prime is 1561359911. The next prime is 1561359931. The reversal of 1561359916 is 6199531651.

It is not an unprimeable number, because it can be changed into a prime (1561359911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2673270 + ... + 2673853.

Almost surely, 2^1561359916 is an apocalyptic number.

It is an amenable number.

1561359916 is a deficient number, since it is larger than the sum of its proper divisors (1208450316).

1561359916 is a wasteful number, since it uses less digits than its factorization.

1561359916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5347200 (or 5347198 counting only the distinct ones).

The product of its digits is 218700, while the sum is 46.

The square root of 1561359916 is about 39514.0470718958. The cubic root of 1561359916 is about 1160.1149103367.

The spelling of 1561359916 in words is "one billion, five hundred sixty-one million, three hundred fifty-nine thousand, nine hundred sixteen".