1561390604 has 12 divisors (see below), whose sum is σ = 2851235184. Its totient is φ = 746751984.

The previous prime is 1561390603. The next prime is 1561390661. The reversal of 1561390604 is 4060931651.

It is not an unprimeable number, because it can be changed into a prime (1561390601) 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, 8485727 + ... + 8485910.

It is an arithmetic number, because the mean of its divisors is an integer number (237602932).

Almost surely, 2^1561390604 is an apocalyptic number.

It is an amenable number.

1561390604 is a deficient number, since it is larger than the sum of its proper divisors (1289844580).

1561390604 is a wasteful number, since it uses less digits than its factorization.

1561390604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16971664 (or 16971662 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 1561390604 is about 39514.4353875897. The cubic root of 1561390604 is about 1160.1225108420.

The spelling of 1561390604 in words is "one billion, five hundred sixty-one million, three hundred ninety thousand, six hundred four".