112661561 has 8 divisors (see below), whose sum is σ = 114048648. Its totient is φ = 111280000.

The previous prime is 112661543. The next prime is 112661569. The reversal of 112661561 is 165166211.

It can be written as a sum of positive squares in 4 ways, for example, as 64705936 + 47955625 = 8044^2 + 6925^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-112661561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (112661569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51551 + ... + 53691.

It is an arithmetic number, because the mean of its divisors is an integer number (14256081).

Almost surely, 2^112661561 is an apocalyptic number.

It is an amenable number.

112661561 is a deficient number, since it is larger than the sum of its proper divisors (1387087).

112661561 is a wasteful number, since it uses less digits than its factorization.

112661561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2763.

The product of its digits is 2160, while the sum is 29.

The square root of 112661561 is about 10614.2150439870. The cubic root of 112661561 is about 482.9756712952.

The spelling of 112661561 in words is "one hundred twelve million, six hundred sixty-one thousand, five hundred sixty-one".