641754449 has 4 divisors (see below), whose sum is σ = 733433664. Its totient is φ = 550075236.

The previous prime is 641754433. The next prime is 641754479. The reversal of 641754449 is 944457146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 944457146 = 2 ⋅472228573.

It is a cyclic number.

It is not a de Polignac number, because 641754449 - 2⁴ = 641754433 is a prime.

It is a super-2 number, since 2×641754449² = 823697545622587202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641754479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45839597 + ... + 45839610.

It is an arithmetic number, because the mean of its divisors is an integer number (183358416).

Almost surely, 2^641754449 is an apocalyptic number.

It is an amenable number.

641754449 is a deficient number, since it is larger than the sum of its proper divisors (91679215).

641754449 is an equidigital number, since it uses as much as digits as its factorization.

641754449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91679214.

The product of its digits is 483840, while the sum is 44.

The square root of 641754449 is about 25332.8728927455. The cubic root of 641754449 is about 862.5606254102.

The spelling of 641754449 in words is "six hundred forty-one million, seven hundred fifty-four thousand, four hundred forty-nine".