2921916651 has 4 divisors (see below), whose sum is σ = 3895888872. Its totient is φ = 1947944432.

The previous prime is 2921916643. The next prime is 2921916689. The reversal of 2921916651 is 1566191292.

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 2921916651 - 2³ = 2921916643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2921916601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486986106 + ... + 486986111.

It is an arithmetic number, because the mean of its divisors is an integer number (973972218).

Almost surely, 2^2921916651 is an apocalyptic number.

2921916651 is a deficient number, since it is larger than the sum of its proper divisors (973972221).

2921916651 is an equidigital number, since it uses as much as digits as its factorization.

2921916651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973972220.

The product of its digits is 58320, while the sum is 42.

The square root of 2921916651 is about 54054.7560442187. The cubic root of 2921916651 is about 1429.6265592086.

The spelling of 2921916651 in words is "two billion, nine hundred twenty-one million, nine hundred sixteen thousand, six hundred fifty-one".