2851953721 has 4 divisors (see below), whose sum is σ = 2871094500. Its totient is φ = 2832812944.

The previous prime is 2851953719. The next prime is 2851953733. The reversal of 2851953721 is 1273591582.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1912837696 + 939116025 = 43736^2 + 30645^2 .

It is a cyclic number.

It is not a de Polignac number, because 2851953721 - 2¹ = 2851953719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2851953791) 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, 9570166 + ... + 9570463.

It is an arithmetic number, because the mean of its divisors is an integer number (717773625).

Almost surely, 2^2851953721 is an apocalyptic number.

It is an amenable number.

2851953721 is a deficient number, since it is larger than the sum of its proper divisors (19140779).

2851953721 is a wasteful number, since it uses less digits than its factorization.

2851953721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19140778.

The product of its digits is 151200, while the sum is 43.

The square root of 2851953721 is about 53403.6863989744. The cubic root of 2851953721 is about 1418.1238399299.

The spelling of 2851953721 in words is "two billion, eight hundred fifty-one million, nine hundred fifty-three thousand, seven hundred twenty-one".