891909469 has 4 divisors (see below), whose sum is σ = 972992160. Its totient is φ = 810826780.

The previous prime is 891909409. The next prime is 891909517. The reversal of 891909469 is 964909198.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-891909469 is a prime.

It is a super-2 number, since 2×891909469² = 1591005001783723922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891909409) 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, 40541329 + ... + 40541350.

It is an arithmetic number, because the mean of its divisors is an integer number (243248040).

Almost surely, 2^891909469 is an apocalyptic number.

It is an amenable number.

891909469 is a deficient number, since it is larger than the sum of its proper divisors (81082691).

891909469 is a wasteful number, since it uses less digits than its factorization.

891909469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81082690.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The square root of 891909469 is about 29864.8534066384. The cubic root of 891909469 is about 962.5875898025.

The spelling of 891909469 in words is "eight hundred ninety-one million, nine hundred nine thousand, four hundred sixty-nine".