2919457721 has 2 divisors, whose sum is σ = 2919457722. Its totient is φ = 2919457720.

The previous prime is 2919457703. The next prime is 2919457763. The reversal of 2919457721 is 1277549192.

2919457721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2918160400 + 1297321 = 54020^2 + 1139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2919457721 is a prime.

It is not a weakly prime, because it can be changed into another prime (2919457771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1459728860 + 1459728861.

It is an arithmetic number, because the mean of its divisors is an integer number (1459728861).

Almost surely, 2^2919457721 is an apocalyptic number.

It is an amenable number.

2919457721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2919457721 is an equidigital number, since it uses as much as digits as its factorization.

2919457721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 47.

The square root of 2919457721 is about 54032.0064498812. The cubic root of 2919457721 is about 1429.2254140440.

The spelling of 2919457721 in words is "two billion, nine hundred nineteen million, four hundred fifty-seven thousand, seven hundred twenty-one".