2116985631 has 4 divisors (see below), whose sum is σ = 2822647512. Its totient is φ = 1411323752.

The previous prime is 2116985621. The next prime is 2116985669. The reversal of 2116985631 is 1365896112.

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

It is a cyclic number.

It is not a de Polignac number, because 2116985631 - 2¹³ = 2116977439 is a prime.

It is a super-2 number, since 2×2116985631² = 8963256323720936322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2116985621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352830936 + ... + 352830941.

It is an arithmetic number, because the mean of its divisors is an integer number (705661878).

Almost surely, 2^2116985631 is an apocalyptic number.

2116985631 is a deficient number, since it is larger than the sum of its proper divisors (705661881).

2116985631 is an equidigital number, since it uses as much as digits as its factorization.

2116985631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705661880.

The product of its digits is 77760, while the sum is 42.

The square root of 2116985631 is about 46010.7121331544. The cubic root of 2116985631 is about 1284.0225082428.

The spelling of 2116985631 in words is "two billion, one hundred sixteen million, nine hundred eighty-five thousand, six hundred thirty-one".