1561106115 has 56 divisors (see below), whose sum is σ = 2818890720. Its totient is φ = 829574784.

The previous prime is 1561106111. The next prime is 1561106137. The reversal of 1561106115 is 5116011651.

It is not a de Polignac number, because 1561106115 - 2² = 1561106111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1561106111) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1307959 + ... + 1309151.

Almost surely, 2^1561106115 is an apocalyptic number.

1561106115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1561106115 is a deficient number, since it is larger than the sum of its proper divisors (1257784605).

1561106115 is an equidigital number, since it uses as much as digits as its factorization.

1561106115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575 (or 1560 counting only the distinct ones).

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

The square root of 1561106115 is about 39510.8354125802. The cubic root of 1561106115 is about 1160.0520475557.

Adding to 1561106115 its reverse (5116011651), we get a palindrome (6677117766).

The spelling of 1561106115 in words is "one billion, five hundred sixty-one million, one hundred six thousand, one hundred fifteen".