891275191 has 2 divisors, whose sum is σ = 891275192. Its totient is φ = 891275190.

The previous prime is 891275131. The next prime is 891275219. The reversal of 891275191 is 191572198.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 891275191 - 2¹⁷ = 891144119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891275131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445637595 + 445637596.

It is an arithmetic number, because the mean of its divisors is an integer number (445637596).

Almost surely, 2^891275191 is an apocalyptic number.

891275191 is a deficient number, since it is larger than the sum of its proper divisors (1).

891275191 is an equidigital number, since it uses as much as digits as its factorization.

891275191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 43.

The square root of 891275191 is about 29854.2323800161. The cubic root of 891275191 is about 962.3593555331.

The spelling of 891275191 in words is "eight hundred ninety-one million, two hundred seventy-five thousand, one hundred ninety-one".