621690677 has 2 divisors, whose sum is σ = 621690678. Its totient is φ = 621690676.

The previous prime is 621690649. The next prime is 621690683. The reversal of 621690677 is 776096126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 575328196 + 46362481 = 23986^2 + 6809^2 .

It is a cyclic number.

It is not a de Polignac number, because 621690677 - 2¹² = 621686581 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621690607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310845338 + 310845339.

It is an arithmetic number, because the mean of its divisors is an integer number (310845339).

Almost surely, 2^621690677 is an apocalyptic number.

It is an amenable number.

621690677 is a deficient number, since it is larger than the sum of its proper divisors (1).

621690677 is an equidigital number, since it uses as much as digits as its factorization.

621690677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 621690677 is about 24933.7256943282. The cubic root of 621690677 is about 853.4762720184.

The spelling of 621690677 in words is "six hundred twenty-one million, six hundred ninety thousand, six hundred seventy-seven".