891949548949 has 4 divisors (see below), whose sum is σ = 891951673536. Its totient is φ = 891947424364.

The previous prime is 891949548937. The next prime is 891949548967. The reversal of 891949548949 is 949845949198.

891949548949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-891949548949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891949548929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198349 + ... + 1350274.

It is an arithmetic number, because the mean of its divisors is an integer number (222987918384).

Almost surely, 2^891949548949 is an apocalyptic number.

It is an amenable number.

891949548949 is a deficient number, since it is larger than the sum of its proper divisors (2124587).

891949548949 is a wasteful number, since it uses less digits than its factorization.

891949548949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2124586.

The product of its digits is 1209323520, while the sum is 79.

The spelling of 891949548949 in words is "eight hundred ninety-one billion, nine hundred forty-nine million, five hundred forty-eight thousand, nine hundred forty-nine".