722626621 has 2 divisors, whose sum is σ = 722626622. Its totient is φ = 722626620.

The previous prime is 722626591. The next prime is 722626637. The reversal of 722626621 is 126626227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 655616025 + 67010596 = 25605^2 + 8186^2 .

It is a cyclic number.

It is not a de Polignac number, because 722626621 - 2⁷ = 722626493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (722626661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361313310 + 361313311.

It is an arithmetic number, because the mean of its divisors is an integer number (361313311).

Almost surely, 2^722626621 is an apocalyptic number.

It is an amenable number.

722626621 is a deficient number, since it is larger than the sum of its proper divisors (1).

722626621 is an equidigital number, since it uses as much as digits as its factorization.

722626621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 34.

The square root of 722626621 is about 26881.7153656533. The cubic root of 722626621 is about 897.3695295843.

The spelling of 722626621 in words is "seven hundred twenty-two million, six hundred twenty-six thousand, six hundred twenty-one".