641574851 has 4 divisors (see below), whose sum is σ = 641625600. Its totient is φ = 641524104.

The previous prime is 641574841. The next prime is 641574877. The reversal of 641574851 is 158475146.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641574851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641574799 and 641574808.

It is not an unprimeable number, because it can be changed into a prime (641574821) 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 3 ways as a sum of consecutive naturals, for example, 10430 + ... + 37308.

It is an arithmetic number, because the mean of its divisors is an integer number (160406400).

Almost surely, 2^641574851 is an apocalyptic number.

641574851 is a deficient number, since it is larger than the sum of its proper divisors (50749).

641574851 is a wasteful number, since it uses less digits than its factorization.

641574851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50748.

The product of its digits is 134400, while the sum is 41.

The square root of 641574851 is about 25329.3278829108. The cubic root of 641574851 is about 862.4801540207.

The spelling of 641574851 in words is "six hundred forty-one million, five hundred seventy-four thousand, eight hundred fifty-one".