641805051 has 16 divisors (see below), whose sum is σ = 865539584. Its totient is φ = 422985024.

The previous prime is 641805013. The next prime is 641805079. The reversal of 641805051 is 150508146.

641805051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 641805051 - 2¹⁷ = 641673979 is a prime.

It is a super-2 number, since 2×641805051² = 823827446978225202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641805011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223215 + ... + 226071.

It is an arithmetic number, because the mean of its divisors is an integer number (54096224).

Almost surely, 2^641805051 is an apocalyptic number.

641805051 is a deficient number, since it is larger than the sum of its proper divisors (223734533).

641805051 is a wasteful number, since it uses less digits than its factorization.

641805051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3690.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 641805051 is about 25333.8716148953. The cubic root of 641805051 is about 862.5832956312.

The spelling of 641805051 in words is "six hundred forty-one million, eight hundred five thousand, fifty-one".