641224477 has 2 divisors, whose sum is σ = 641224478. Its totient is φ = 641224476.

The previous prime is 641224447. The next prime is 641224517. The reversal of 641224477 is 774422146.

641224477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 419184676 + 222039801 = 20474^2 + 14901^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641224477 is a prime.

It is a super-2 number, since 2×641224477² = 822337659807847058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641224447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320612238 + 320612239.

It is an arithmetic number, because the mean of its divisors is an integer number (320612239).

Almost surely, 2^641224477 is an apocalyptic number.

It is an amenable number.

641224477 is a deficient number, since it is larger than the sum of its proper divisors (1).

641224477 is an equidigital number, since it uses as much as digits as its factorization.

641224477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 37.

The square root of 641224477 is about 25322.4105685063. The cubic root of 641224477 is about 862.3231208244.

The spelling of 641224477 in words is "six hundred forty-one million, two hundred twenty-four thousand, four hundred seventy-seven".