641376427 has 2 divisors, whose sum is σ = 641376428. Its totient is φ = 641376426.

The previous prime is 641376419. The next prime is 641376443. The reversal of 641376427 is 724673146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641376427 - 2³ = 641376419 is a prime.

It is a super-2 number, since 2×641376427² = 822727442222572658, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641376427.

It is not a weakly prime, because it can be changed into another prime (641376457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320688213 + 320688214.

It is an arithmetic number, because the mean of its divisors is an integer number (320688214).

Almost surely, 2^641376427 is an apocalyptic number.

641376427 is a deficient number, since it is larger than the sum of its proper divisors (1).

641376427 is an equidigital number, since it uses as much as digits as its factorization.

641376427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 40.

The square root of 641376427 is about 25325.4106975583. The cubic root of 641376427 is about 862.3912299158.

The spelling of 641376427 in words is "six hundred forty-one million, three hundred seventy-six thousand, four hundred twenty-seven".