7924625221 has 2 divisors, whose sum is σ = 7924625222. Its totient is φ = 7924625220.

The previous prime is 7924625117. The next prime is 7924625239. The reversal of 7924625221 is 1225264297.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6891324196 + 1033301025 = 83014^2 + 32145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7924625221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7924626221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3962312610 + 3962312611.

It is an arithmetic number, because the mean of its divisors is an integer number (3962312611).

Almost surely, 2^7924625221 is an apocalyptic number.

It is an amenable number.

7924625221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7924625221 is an equidigital number, since it uses as much as digits as its factorization.

7924625221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 7924625221 is about 89020.3640803608. The cubic root of 7924625221 is about 1993.6989375706.

The spelling of 7924625221 in words is "seven billion, nine hundred twenty-four million, six hundred twenty-five thousand, two hundred twenty-one".