891022371647 has 16 divisors (see below), whose sum is σ = 933079416192. Its totient is φ = 849969070080.

The previous prime is 891022371607. The next prime is 891022371667. The reversal of 891022371647 is 746173220198.

It is a cyclic number.

It is not a de Polignac number, because 891022371647 - 2¹⁴ = 891022355263 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 891022371595 and 891022371604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891022371607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1766783 + ... + 2214399.

It is an arithmetic number, because the mean of its divisors is an integer number (58317463512).

Almost surely, 2^891022371647 is an apocalyptic number.

891022371647 is a deficient number, since it is larger than the sum of its proper divisors (42057044545).

891022371647 is a wasteful number, since it uses less digits than its factorization.

891022371647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448738.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 891022371647 in words is "eight hundred ninety-one billion, twenty-two million, three hundred seventy-one thousand, six hundred forty-seven".