7405075621 has 2 divisors, whose sum is σ = 7405075622. Its totient is φ = 7405075620.

The previous prime is 7405075529. The next prime is 7405075627. The reversal of 7405075621 is 1265705047.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7393420225 + 11655396 = 85985^2 + 3414^2 .

It is an emirp because it is prime and its reverse (1265705047) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7405075621 - 2⁹ = 7405075109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7405075627) 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 as a sum of consecutive naturals, namely, 3702537810 + 3702537811.

It is an arithmetic number, because the mean of its divisors is an integer number (3702537811).

Almost surely, 2^7405075621 is an apocalyptic number.

It is an amenable number.

7405075621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7405075621 is an equidigital number, since it uses as much as digits as its factorization.

7405075621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58800, while the sum is 37.

The square root of 7405075621 is about 86052.7490612589. The cubic root of 7405075621 is about 1949.1405917973.

The spelling of 7405075621 in words is "seven billion, four hundred five million, seventy-five thousand, six hundred twenty-one".