70839871 has 2 divisors, whose sum is σ = 70839872. Its totient is φ = 70839870.

The previous prime is 70839869. The next prime is 70839883. The reversal of 70839871 is 17893807.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 70839871 - 2¹ = 70839869 is a prime.

Together with 70839869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70839851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35419935 + 35419936.

It is an arithmetic number, because the mean of its divisors is an integer number (35419936).

Almost surely, 2^70839871 is an apocalyptic number.

70839871 is a deficient number, since it is larger than the sum of its proper divisors (1).

70839871 is an equidigital number, since it uses as much as digits as its factorization.

70839871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 70839871 is about 8416.6425016155. The cubic root of 70839871 is about 413.7702424965.

The spelling of 70839871 in words is "seventy million, eight hundred thirty-nine thousand, eight hundred seventy-one".