34781891 has 2 divisors, whose sum is σ = 34781892. Its totient is φ = 34781890.

The previous prime is 34781869. The next prime is 34781893. The reversal of 34781891 is 19818743.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 34781891 - 2⁶ = 34781827 is a prime.

Together with 34781893, 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 (34781893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17390945 + 17390946.

It is an arithmetic number, because the mean of its divisors is an integer number (17390946).

Almost surely, 2^34781891 is an apocalyptic number.

34781891 is a deficient number, since it is larger than the sum of its proper divisors (1).

34781891 is an equidigital number, since it uses as much as digits as its factorization.

34781891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 34781891 is about 5897.6174002728. The cubic root of 34781891 is about 326.4257394468.

The spelling of 34781891 in words is "thirty-four million, seven hundred eighty-one thousand, eight hundred ninety-one".