112812991 has 4 divisors (see below), whose sum is σ = 114941592. Its totient is φ = 110684392.

The previous prime is 112812961. The next prime is 112813021. The reversal of 112812991 is 199218211.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (112812961) and next prime (112813021).

It is a cyclic number.

It is not a de Polignac number, because 112812991 - 2¹⁵ = 112780223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (112812941) 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, 1064221 + ... + 1064326.

It is an arithmetic number, because the mean of its divisors is an integer number (28735398).

Almost surely, 2^112812991 is an apocalyptic number.

112812991 is a deficient number, since it is larger than the sum of its proper divisors (2128601).

112812991 is an equidigital number, since it uses as much as digits as its factorization.

112812991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2128600.

The product of its digits is 2592, while the sum is 34.

The square root of 112812991 is about 10621.3460069805. The cubic root of 112812991 is about 483.1919658963.

The spelling of 112812991 in words is "one hundred twelve million, eight hundred twelve thousand, nine hundred ninety-one".