641391528923 has 2 divisors, whose sum is σ = 641391528924. Its totient is φ = 641391528922.

The previous prime is 641391528857. The next prime is 641391529061. The reversal of 641391528923 is 329825193146.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641391528923 - 2¹² = 641391524827 is a prime.

It is a super-2 number, since 2×641391528923² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641391525923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320695764461 + 320695764462.

It is an arithmetic number, because the mean of its divisors is an integer number (320695764462).

Almost surely, 2^641391528923 is an apocalyptic number.

641391528923 is a deficient number, since it is larger than the sum of its proper divisors (1).

641391528923 is an equidigital number, since it uses as much as digits as its factorization.

641391528923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 53.

The spelling of 641391528923 in words is "six hundred forty-one billion, three hundred ninety-one million, five hundred twenty-eight thousand, nine hundred twenty-three".