891163230722 has 6 divisors (see below), whose sum is σ = 1336746848643. Its totient is φ = 445580947842.

The previous prime is 891163230719. The next prime is 891163230773. The reversal of 891163230722 is 227032361198.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 445581615361 + 445581615361 = 667519^2 + 667519^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=667519.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1001279 + ... + 1668797.

Almost surely, 2^891163230722 is an apocalyptic number.

891163230722 is a deficient number, since it is larger than the sum of its proper divisors (445583617921).

891163230722 is an frugal number, since it uses more digits than its factorization.

891163230722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335040 (or 667521 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 891163230722 in words is "eight hundred ninety-one billion, one hundred sixty-three million, two hundred thirty thousand, seven hundred twenty-two".