2149509851 has 4 divisors (see below), whose sum is σ = 2162697192. Its totient is φ = 2136322512.

The previous prime is 2149509821. The next prime is 2149509863. The reversal of 2149509851 is 1589059412.

2149509851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2149509851 - 2¹⁸ = 2149247707 is a prime.

It is a super-3 number, since 3×2149509851³ (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 (2149509811) 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, 6593426 + ... + 6593751.

It is an arithmetic number, because the mean of its divisors is an integer number (540674298).

Almost surely, 2^2149509851 is an apocalyptic number.

2149509851 is a deficient number, since it is larger than the sum of its proper divisors (13187341).

2149509851 is a wasteful number, since it uses less digits than its factorization.

2149509851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13187340.

The product of its (nonzero) digits is 129600, while the sum is 44.

The square root of 2149509851 is about 46362.8067636117. The cubic root of 2149509851 is about 1290.5647930461.

It can be divided in two parts, 2149 and 509851, that added together give a cube (512000 = 80³).

The spelling of 2149509851 in words is "two billion, one hundred forty-nine million, five hundred nine thousand, eight hundred fifty-one".