2138774851 has 4 divisors (see below), whose sum is σ = 2139360192. Its totient is φ = 2138189512.

The previous prime is 2138774801. The next prime is 2138774857. The reversal of 2138774851 is 1584778312.

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 2138774851 - 2¹¹ = 2138772803 is a prime.

It is a super-3 number, since 3×2138774851³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2138774857) 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, 287155 + ... + 294508.

It is an arithmetic number, because the mean of its divisors is an integer number (534840048).

Almost surely, 2^2138774851 is an apocalyptic number.

2138774851 is a deficient number, since it is larger than the sum of its proper divisors (585341).

2138774851 is an equidigital number, since it uses as much as digits as its factorization.

2138774851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585340.

The product of its digits is 376320, while the sum is 46.

The square root of 2138774851 is about 46246.8901765297. The cubic root of 2138774851 is about 1288.4127767550.

The spelling of 2138774851 in words is "two billion, one hundred thirty-eight million, seven hundred seventy-four thousand, eight hundred fifty-one".