641896451 has 8 divisors (see below), whose sum is σ = 751488864. Its totient is φ = 536777280.

The previous prime is 641896379. The next prime is 641896477. The reversal of 641896451 is 154698146.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641896451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641896751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1118000 + ... + 1118573.

It is an arithmetic number, because the mean of its divisors is an integer number (93936108).

Almost surely, 2^641896451 is an apocalyptic number.

641896451 is a deficient number, since it is larger than the sum of its proper divisors (109592413).

641896451 is a wasteful number, since it uses less digits than its factorization.

641896451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236621.

The product of its digits is 207360, while the sum is 44.

The square root of 641896451 is about 25335.6754597149. The cubic root of 641896451 is about 862.6242407597.

The spelling of 641896451 in words is "six hundred forty-one million, eight hundred ninety-six thousand, four hundred fifty-one".