7572281621 has 2 divisors, whose sum is σ = 7572281622. Its totient is φ = 7572281620.

The previous prime is 7572281617. The next prime is 7572281699. The reversal of 7572281621 is 1261822757.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6903283396 + 668998225 = 83086^2 + 25865^2 .

It is a cyclic number.

It is not a de Polignac number, because 7572281621 - 2² = 7572281617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7572281921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3786140810 + 3786140811.

It is an arithmetic number, because the mean of its divisors is an integer number (3786140811).

Almost surely, 2^7572281621 is an apocalyptic number.

It is an amenable number.

7572281621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7572281621 is an equidigital number, since it uses as much as digits as its factorization.

7572281621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94080, while the sum is 41.

The square root of 7572281621 is about 87018.8578470207. The cubic root of 7572281621 is about 1963.7020152500.

The spelling of 7572281621 in words is "seven billion, five hundred seventy-two million, two hundred eighty-one thousand, six hundred twenty-one".