641641051 has 8 divisors (see below), whose sum is σ = 672322464. Its totient is φ = 611191680.

The previous prime is 641641043. The next prime is 641641109. The reversal of 641641051 is 150146146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641641051 - 2³ = 641641043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641641031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52336 + ... + 63421.

It is an arithmetic number, because the mean of its divisors is an integer number (84040308).

Almost surely, 2^641641051 is an apocalyptic number.

641641051 is the 16021-st centered pentagonal number.

641641051 is a deficient number, since it is larger than the sum of its proper divisors (30681413).

641641051 is a wasteful number, since it uses less digits than its factorization.

641641051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116021.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 641641051 is about 25330.6346347659. The cubic root of 641641051 is about 862.5098176016.

Adding to 641641051 its reverse (150146146), we get a palindrome (791787197).

The spelling of 641641051 in words is "six hundred forty-one million, six hundred forty-one thousand, fifty-one".