621868697 has 2 divisors, whose sum is σ = 621868698. Its totient is φ = 621868696.

The previous prime is 621868693. The next prime is 621868739. The reversal of 621868697 is 796868126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 570445456 + 51423241 = 23884^2 + 7171^2 .

It is a cyclic number.

It is not a de Polignac number, because 621868697 - 2² = 621868693 is a prime.

It is not a weakly prime, because it can be changed into another prime (621868693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310934348 + 310934349.

It is an arithmetic number, because the mean of its divisors is an integer number (310934349).

Almost surely, 2^621868697 is an apocalyptic number.

It is an amenable number.

621868697 is a deficient number, since it is larger than the sum of its proper divisors (1).

621868697 is an equidigital number, since it uses as much as digits as its factorization.

621868697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 53.

The square root of 621868697 is about 24937.2953024180. The cubic root of 621868697 is about 853.5577280392.

The spelling of 621868697 in words is "six hundred twenty-one million, eight hundred sixty-eight thousand, six hundred ninety-seven".