2116178231 has 4 divisors (see below), whose sum is σ = 2116908600. Its totient is φ = 2115447864.

The previous prime is 2116178179. The next prime is 2116178279. The reversal of 2116178231 is 1328716112.

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 2116178231 - 2¹⁸ = 2115916087 is a prime.

It is a super-2 number, since 2×2116178231² = 8956420610716578722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2116178131) 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, 360821 + ... + 366638.

It is an arithmetic number, because the mean of its divisors is an integer number (529227150).

Almost surely, 2^2116178231 is an apocalyptic number.

2116178231 is a deficient number, since it is larger than the sum of its proper divisors (730369).

2116178231 is an equidigital number, since it uses as much as digits as its factorization.

2116178231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730368.

The product of its digits is 4032, while the sum is 32.

The square root of 2116178231 is about 46001.9372526853. The cubic root of 2116178231 is about 1283.8592491281.

The spelling of 2116178231 in words is "two billion, one hundred sixteen million, one hundred seventy-eight thousand, two hundred thirty-one".