70891967 has 2 divisors, whose sum is σ = 70891968. Its totient is φ = 70891966.

The previous prime is 70891939. The next prime is 70891969. The reversal of 70891967 is 76919807.

It is a strong prime.

It is an emirp because it is prime and its reverse (76919807) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70891967 - 2¹⁰ = 70890943 is a prime.

Together with 70891969, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70891969) 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, 35445983 + 35445984.

It is an arithmetic number, because the mean of its divisors is an integer number (35445984).

Almost surely, 2^70891967 is an apocalyptic number.

70891967 is a deficient number, since it is larger than the sum of its proper divisors (1).

70891967 is an equidigital number, since it uses as much as digits as its factorization.

70891967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 70891967 is about 8419.7367536046. The cubic root of 70891967 is about 413.8716472202.

The spelling of 70891967 in words is "seventy million, eight hundred ninety-one thousand, nine hundred sixty-seven".