70843891 has 2 divisors, whose sum is σ = 70843892. Its totient is φ = 70843890.

The previous prime is 70843889. The next prime is 70843907. The reversal of 70843891 is 19834807.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 70843891 - 2¹ = 70843889 is a prime.

Together with 70843889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (70843831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35421945 + 35421946.

It is an arithmetic number, because the mean of its divisors is an integer number (35421946).

Almost surely, 2^70843891 is an apocalyptic number.

70843891 is a deficient number, since it is larger than the sum of its proper divisors (1).

70843891 is an equidigital number, since it uses as much as digits as its factorization.

70843891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 70843891 is about 8416.8813107944. The cubic root of 70843891 is about 413.7780691855.

The spelling of 70843891 in words is "seventy million, eight hundred forty-three thousand, eight hundred ninety-one".