641466491 has 8 divisors (see below), whose sum is σ = 687798720. Its totient is φ = 596089728.

The previous prime is 641466439. The next prime is 641466493. The reversal of 641466491 is 194664146.

It is a happy number.

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 641466491 - 2¹⁴ = 641450107 is a prime.

It is a super-2 number, since 2×641466491² = 822958518151706162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641466493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237476 + ... + 240161.

It is an arithmetic number, because the mean of its divisors is an integer number (85974840).

Almost surely, 2^641466491 is an apocalyptic number.

641466491 is a deficient number, since it is larger than the sum of its proper divisors (46332229).

641466491 is a wasteful number, since it uses less digits than its factorization.

641466491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477733.

The product of its digits is 124416, while the sum is 41.

The square root of 641466491 is about 25327.1887701734. The cubic root of 641466491 is about 862.4315945469.

The spelling of 641466491 in words is "six hundred forty-one million, four hundred sixty-six thousand, four hundred ninety-one".