641028797 has 2 divisors, whose sum is σ = 641028798. Its totient is φ = 641028796.

The previous prime is 641028781. The next prime is 641028823. The reversal of 641028797 is 797820146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 377486041 + 263542756 = 19429^2 + 16234^2 .

It is a cyclic number.

It is not a de Polignac number, because 641028797 - 2⁴ = 641028781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641028697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320514398 + 320514399.

It is an arithmetic number, because the mean of its divisors is an integer number (320514399).

Almost surely, 2^641028797 is an apocalyptic number.

It is an amenable number.

641028797 is a deficient number, since it is larger than the sum of its proper divisors (1).

641028797 is an equidigital number, since it uses as much as digits as its factorization.

641028797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 641028797 is about 25318.5465025147. The cubic root of 641028797 is about 862.2353946267.

The spelling of 641028797 in words is "six hundred forty-one million, twenty-eight thousand, seven hundred ninety-seven".