891398147 has 2 divisors, whose sum is σ = 891398148. Its totient is φ = 891398146.

The previous prime is 891398093. The next prime is 891398161. The reversal of 891398147 is 741893198.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 891398147 - 2⁸ = 891397891 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 891398095 and 891398104.

It is not a weakly prime, because it can be changed into another prime (891398047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445699073 + 445699074.

It is an arithmetic number, because the mean of its divisors is an integer number (445699074).

Almost surely, 2^891398147 is an apocalyptic number.

891398147 is a deficient number, since it is larger than the sum of its proper divisors (1).

891398147 is an equidigital number, since it uses as much as digits as its factorization.

891398147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 50.

The square root of 891398147 is about 29856.2915815076. The cubic root of 891398147 is about 962.4036076404.

The spelling of 891398147 in words is "eight hundred ninety-one million, three hundred ninety-eight thousand, one hundred forty-seven".