891381079 has 2 divisors, whose sum is σ = 891381080. Its totient is φ = 891381078.

The previous prime is 891381053. The next prime is 891381089. The reversal of 891381079 is 970183198.

891381079 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 891381079 - 2¹³ = 891372887 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891381089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445690539 + 445690540.

It is an arithmetic number, because the mean of its divisors is an integer number (445690540).

Almost surely, 2^891381079 is an apocalyptic number.

891381079 is a deficient number, since it is larger than the sum of its proper divisors (1).

891381079 is an equidigital number, since it uses as much as digits as its factorization.

891381079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 891381079 is about 29856.0057442385. The cubic root of 891381079 is about 962.3974650767.

The spelling of 891381079 in words is "eight hundred ninety-one million, three hundred eighty-one thousand, seventy-nine".