112155721 has 4 divisors (see below), whose sum is σ = 112181200. Its totient is φ = 112130244.

The previous prime is 112155707. The next prime is 112155761. The reversal of 112155721 is 127551211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-112155721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (112155761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4251 + ... + 15568.

It is an arithmetic number, because the mean of its divisors is an integer number (28045300).

Almost surely, 2^112155721 is an apocalyptic number.

It is an amenable number.

112155721 is a deficient number, since it is larger than the sum of its proper divisors (25479).

112155721 is an equidigital number, since it uses as much as digits as its factorization.

112155721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25478.

The product of its digits is 700, while the sum is 25.

The square root of 112155721 is about 10590.3598144728. The cubic root of 112155721 is about 482.2517480484.

The spelling of 112155721 in words is "one hundred twelve million, one hundred fifty-five thousand, seven hundred twenty-one".