7949503721 has 2 divisors, whose sum is σ = 7949503722. Its totient is φ = 7949503720.

The previous prime is 7949503673. The next prime is 7949503729. The reversal of 7949503721 is 1273059497.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4076184025 + 3873319696 = 63845^2 + 62236^2 .

It is an emirp because it is prime and its reverse (1273059497) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7949503721 - 2²⁶ = 7882394857 is a prime.

It is not a weakly prime, because it can be changed into another prime (7949503729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3974751860 + 3974751861.

It is an arithmetic number, because the mean of its divisors is an integer number (3974751861).

Almost surely, 2^7949503721 is an apocalyptic number.

It is an amenable number.

7949503721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7949503721 is an equidigital number, since it uses as much as digits as its factorization.

7949503721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 476280, while the sum is 47.

The square root of 7949503721 is about 89159.9894627629. The cubic root of 7949503721 is about 1995.7830918417.

The spelling of 7949503721 in words is "seven billion, nine hundred forty-nine million, five hundred three thousand, seven hundred twenty-one".