1112112561 has 16 divisors (see below), whose sum is σ = 1753084800. Its totient is φ = 613579008.

The previous prime is 1112112557. The next prime is 1112112563. The reversal of 1112112561 is 1652112111.

It is not a de Polignac number, because 1112112561 - 2² = 1112112557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1112112563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 912456 + ... + 913673.

It is an arithmetic number, because the mean of its divisors is an integer number (109567800).

Almost surely, 2^1112112561 is an apocalyptic number.

It is an amenable number.

1112112561 is a deficient number, since it is larger than the sum of its proper divisors (640972239).

1112112561 is a wasteful number, since it uses less digits than its factorization.

1112112561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826168.

The product of its digits is 120, while the sum is 21.

The square root of 1112112561 is about 33348.3516983973. The cubic root of 1112112561 is about 1036.0552489754.

Adding to 1112112561 its reverse (1652112111), we get a palindrome (2764224672).

The spelling of 1112112561 in words is "one billion, one hundred twelve million, one hundred twelve thousand, five hundred sixty-one".