84835391 has 2 divisors, whose sum is σ = 84835392. Its totient is φ = 84835390.

The previous prime is 84835367. The next prime is 84835393. The reversal of 84835391 is 19353848.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84835391 is a prime.

It is a super-2 number, since 2×84835391² = 14394087132245762, which contains 22 as substring.

Together with 84835393, 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 (84835393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42417695 + 42417696.

It is an arithmetic number, because the mean of its divisors is an integer number (42417696).

Almost surely, 2^84835391 is an apocalyptic number.

84835391 is a deficient number, since it is larger than the sum of its proper divisors (1).

84835391 is an equidigital number, since it uses as much as digits as its factorization.

84835391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 84835391 is about 9210.6129546301. The cubic root of 84835391 is about 439.3989572382.

The spelling of 84835391 in words is "eighty-four million, eight hundred thirty-five thousand, three hundred ninety-one".