70043891 has 2 divisors, whose sum is σ = 70043892. Its totient is φ = 70043890.

The previous prime is 70043881. The next prime is 70043957. The reversal of 70043891 is 19834007.

It is a weak prime.

It is an emirp because it is prime and its reverse (19834007) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70043891 - 2²⁶ = 2935027 is a prime.

It is a super-2 number, since 2×70043891² = 9812293332839762, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70043881) 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 as a sum of consecutive naturals, namely, 35021945 + 35021946.

It is an arithmetic number, because the mean of its divisors is an integer number (35021946).

Almost surely, 2^70043891 is an apocalyptic number.

70043891 is a deficient number, since it is larger than the sum of its proper divisors (1).

70043891 is an equidigital number, since it uses as much as digits as its factorization.

70043891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 70043891 is about 8369.2228432513. Note that the first 3 decimals coincide. The cubic root of 70043891 is about 412.2146488094.

Adding to 70043891 its reverse (19834007), we get a palindrome (89877898).

The spelling of 70043891 in words is "seventy million, forty-three thousand, eight hundred ninety-one".