1561601115 has 48 divisors (see below), whose sum is σ = 2776831200. Its totient is φ = 811399680.

The previous prime is 1561601087. The next prime is 1561601131. The reversal of 1561601115 is 5111061651.

1561601115 is a `hidden beast` number, since 1 + 56 + 1 + 601 + 1 + 1 + 5 = 666.

It is not a de Polignac number, because 1561601115 - 2⁷ = 1561600987 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1007361 + ... + 1008909.

It is an arithmetic number, because the mean of its divisors is an integer number (57850650).

Almost surely, 2^1561601115 is an apocalyptic number.

1561601115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1561601115 is a deficient number, since it is larger than the sum of its proper divisors (1215230085).

1561601115 is a wasteful number, since it uses less digits than its factorization.

1561601115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2124 (or 2121 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

The square root of 1561601115 is about 39517.0990205506. The cubic root of 1561601115 is about 1160.1746454744.

Adding to 1561601115 its reverse (5111061651), we get a palindrome (6672662766).

The spelling of 1561601115 in words is "one billion, five hundred sixty-one million, six hundred one thousand, one hundred fifteen".