7442772521 has 2 divisors, whose sum is σ = 7442772522. Its totient is φ = 7442772520.

The previous prime is 7442772439. The next prime is 7442772529. The reversal of 7442772521 is 1252772447.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6262506496 + 1180266025 = 79136^2 + 34355^2 .

It is a cyclic number.

It is not a de Polignac number, because 7442772521 - 2³⁰ = 6369030697 is a prime.

It is not a weakly prime, because it can be changed into another prime (7442772529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3721386260 + 3721386261.

It is an arithmetic number, because the mean of its divisors is an integer number (3721386261).

Almost surely, 2^7442772521 is an apocalyptic number.

It is an amenable number.

7442772521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7442772521 is an equidigital number, since it uses as much as digits as its factorization.

7442772521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 219520, while the sum is 41.

The square root of 7442772521 is about 86271.5046872373. The cubic root of 7442772521 is about 1952.4424814370.

The spelling of 7442772521 in words is "seven billion, four hundred forty-two million, seven hundred seventy-two thousand, five hundred twenty-one".