621426697 has 2 divisors, whose sum is σ = 621426698. Its totient is φ = 621426696.

The previous prime is 621426691. The next prime is 621426731. The reversal of 621426697 is 796624126.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 524226816 + 97199881 = 22896^2 + 9859^2 .

It is a cyclic number.

It is not a de Polignac number, because 621426697 - 2¹⁹ = 620902409 is a prime.

It is a super-2 number, since 2×621426697² = 772342279488659618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (621426691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310713348 + 310713349.

It is an arithmetic number, because the mean of its divisors is an integer number (310713349).

Almost surely, 2^621426697 is an apocalyptic number.

It is an amenable number.

621426697 is a deficient number, since it is larger than the sum of its proper divisors (1).

621426697 is an equidigital number, since it uses as much as digits as its factorization.

621426697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The square root of 621426697 is about 24928.4314989933. The cubic root of 621426697 is about 853.3554549353.

The spelling of 621426697 in words is "six hundred twenty-one million, four hundred twenty-six thousand, six hundred ninety-seven".