86747891 has 2 divisors, whose sum is σ = 86747892. Its totient is φ = 86747890.

The previous prime is 86747879. The next prime is 86747893. The reversal of 86747891 is 19874768.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86747891 - 2¹⁴ = 86731507 is a prime.

Together with 86747893, 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 (86747893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43373945 + 43373946.

It is an arithmetic number, because the mean of its divisors is an integer number (43373946).

Almost surely, 2^86747891 is an apocalyptic number.

86747891 is a deficient number, since it is larger than the sum of its proper divisors (1).

86747891 is an equidigital number, since it uses as much as digits as its factorization.

86747891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 50.

The square root of 86747891 is about 9313.8547873585. The cubic root of 86747891 is about 442.6763377334.

The spelling of 86747891 in words is "eighty-six million, seven hundred forty-seven thousand, eight hundred ninety-one".