2118691875 has 30 divisors (see below), whose sum is σ = 3533347092. Its totient is φ = 1128906000.

The previous prime is 2118691873. The next prime is 2118691879. The reversal of 2118691875 is 5781968112.

It is a happy number.

It is not a de Polignac number, because 2118691875 - 2¹ = 2118691873 is a prime.

It is a super-2 number, since 2×2118691875² = 8977710522382031250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2118691873) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1992594 + ... + 1993656.

Almost surely, 2^2118691875 is an apocalyptic number.

2118691875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2118691875 is a deficient number, since it is larger than the sum of its proper divisors (1414655217).

2118691875 is an frugal number, since it uses more digits than its factorization.

2118691875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149 (or 1071 counting only the distinct ones).

The product of its digits is 241920, while the sum is 48.

The square root of 2118691875 is about 46029.2502111429. The cubic root of 2118691875 is about 1284.3673802687.

Multiplying 2118691875 by its sum of digits (48), we get a square (101697210000 = 318900²).

The spelling of 2118691875 in words is "two billion, one hundred eighteen million, six hundred ninety-one thousand, eight hundred seventy-five".