86781899 has 2 divisors, whose sum is σ = 86781900. Its totient is φ = 86781898.

The previous prime is 86781887. The next prime is 86781901. The reversal of 86781899 is 99818768.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86781899 - 2⁴ = 86781883 is a prime.

Together with 86781901, 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 (86771899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43390949 + 43390950.

It is an arithmetic number, because the mean of its divisors is an integer number (43390950).

Almost surely, 2^86781899 is an apocalyptic number.

86781899 is a deficient number, since it is larger than the sum of its proper divisors (1).

86781899 is an equidigital number, since it uses as much as digits as its factorization.

86781899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 56.

The square root of 86781899 is about 9315.6802757501. The cubic root of 86781899 is about 442.7341780253.

The spelling of 86781899 in words is "eighty-six million, seven hundred eighty-one thousand, eight hundred ninety-nine".