2921381849 has 4 divisors (see below), whose sum is σ = 2925241764. Its totient is φ = 2917521936.

The previous prime is 2921381839. The next prime is 2921381899. The reversal of 2921381849 is 9481831292.

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 671587225 + 2249794624 = 25915^2 + 47432^2 .

It is a cyclic number.

It is not a de Polignac number, because 2921381849 - 2²⁸ = 2652946393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2921381809) 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, 1928822 + ... + 1930335.

It is an arithmetic number, because the mean of its divisors is an integer number (731310441).

Almost surely, 2^2921381849 is an apocalyptic number.

It is an amenable number.

2921381849 is a deficient number, since it is larger than the sum of its proper divisors (3859915).

2921381849 is an equidigital number, since it uses as much as digits as its factorization.

2921381849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3859914.

The product of its digits is 248832, while the sum is 47.

The square root of 2921381849 is about 54049.8089635847. The cubic root of 2921381849 is about 1429.5393317839.

The spelling of 2921381849 in words is "two billion, nine hundred twenty-one million, three hundred eighty-one thousand, eight hundred forty-nine".