7942443521 has 2 divisors, whose sum is σ = 7942443522. Its totient is φ = 7942443520.

The previous prime is 7942443499. The next prime is 7942443541. The reversal of 7942443521 is 1253442497.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6819456400 + 1122987121 = 82580^2 + 33511^2 .

It is an emirp because it is prime and its reverse (1253442497) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7942443521 is a prime.

It is not a weakly prime, because it can be changed into another prime (7942443541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3971221760 + 3971221761.

It is an arithmetic number, because the mean of its divisors is an integer number (3971221761).

Almost surely, 2^7942443521 is an apocalyptic number.

It is an amenable number.

7942443521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7942443521 is an equidigital number, since it uses as much as digits as its factorization.

7942443521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 41.

The square root of 7942443521 is about 89120.3877965082. The cubic root of 7942443521 is about 1995.1920779545.

The spelling of 7942443521 in words is "seven billion, nine hundred forty-two million, four hundred forty-three thousand, five hundred twenty-one".