70868891 has 2 divisors, whose sum is σ = 70868892. Its totient is φ = 70868890.

The previous prime is 70868873. The next prime is 70868893. The reversal of 70868891 is 19886807.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 70868891 - 2⁶ = 70868827 is a prime.

Together with 70868893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70868893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35434445 + 35434446.

It is an arithmetic number, because the mean of its divisors is an integer number (35434446).

Almost surely, 2^70868891 is an apocalyptic number.

70868891 is a deficient number, since it is larger than the sum of its proper divisors (1).

70868891 is an equidigital number, since it uses as much as digits as its factorization.

70868891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 70868891 is about 8418.3662904390. The cubic root of 70868891 is about 413.8267359795.

The spelling of 70868891 in words is "seventy million, eight hundred sixty-eight thousand, eight hundred ninety-one".