621690711532391 has 2 divisors, whose sum is σ = 621690711532392. Its totient is φ = 621690711532390.

The previous prime is 621690711532357. The next prime is 621690711532463. The reversal of 621690711532391 is 193235117096126.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621690711532391 - 2⁶ = 621690711532327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621690713532391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310845355766195 + 310845355766196.

It is an arithmetic number, because the mean of its divisors is an integer number (310845355766196).

Almost surely, 2^{621690711532391} is an apocalyptic number.

621690711532391 is a deficient number, since it is larger than the sum of its proper divisors (1).

621690711532391 is an equidigital number, since it uses as much as digits as its factorization.

621690711532391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3674160, while the sum is 56.

The spelling of 621690711532391 in words is "six hundred twenty-one trillion, six hundred ninety billion, seven hundred eleven million, five hundred thirty-two thousand, three hundred ninety-one".