891072673 has 4 divisors (see below), whose sum is σ = 899723968. Its totient is φ = 882421380.

The previous prime is 891072643. The next prime is 891072691. The reversal of 891072673 is 376270198.

It is a happy number.

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: 376270198 = 2 ⋅188135099.

It is a cyclic number.

It is not a de Polignac number, because 891072673 - 2⁵ = 891072641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891072613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4325493 + ... + 4325698.

It is an arithmetic number, because the mean of its divisors is an integer number (224930992).

Almost surely, 2^891072673 is an apocalyptic number.

It is an amenable number.

891072673 is a deficient number, since it is larger than the sum of its proper divisors (8651295).

891072673 is a wasteful number, since it uses less digits than its factorization.

891072673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8651294.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 891072673 is about 29850.8404069299. The cubic root of 891072673 is about 962.2864600319.

The spelling of 891072673 in words is "eight hundred ninety-one million, seventy-two thousand, six hundred seventy-three".