1561601116 has 12 divisors (see below), whose sum is σ = 2784364632. Its totient is φ = 766068368.

The previous prime is 1561601087. The next prime is 1561601131. The reversal of 1561601116 is 6111061651.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3682810 + ... + 3683233.

It is an arithmetic number, because the mean of its divisors is an integer number (232030386).

Almost surely, 2^1561601116 is an apocalyptic number.

It is an amenable number.

1561601116 is a deficient number, since it is larger than the sum of its proper divisors (1222763516).

1561601116 is a wasteful number, since it uses less digits than its factorization.

1561601116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7366100 (or 7366098 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 1561601116 is about 39517.0990332033. The cubic root of 1561601116 is about 1160.1746457220.

Adding to 1561601116 its reverse (6111061651), we get a palindrome (7672662767).

The spelling of 1561601116 in words is "one billion, five hundred sixty-one million, six hundred one thousand, one hundred sixteen".