2112857987 has 4 divisors (see below), whose sum is σ = 2126850576. Its totient is φ = 2098865400.

The previous prime is 2112857951. The next prime is 2112858001. The reversal of 2112857987 is 7897582112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2112857987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2112857927) 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, 6996068 + ... + 6996369.

It is an arithmetic number, because the mean of its divisors is an integer number (531712644).

Almost surely, 2^2112857987 is an apocalyptic number.

2112857987 is a deficient number, since it is larger than the sum of its proper divisors (13992589).

2112857987 is a wasteful number, since it uses less digits than its factorization.

2112857987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13992588.

The product of its digits is 564480, while the sum is 50.

The square root of 2112857987 is about 45965.8349973108. The cubic root of 2112857987 is about 1283.1874472873.

The spelling of 2112857987 in words is "two billion, one hundred twelve million, eight hundred fifty-seven thousand, nine hundred eighty-seven".