86781029 has 2 divisors, whose sum is σ = 86781030. Its totient is φ = 86781028.

The previous prime is 86781011. The next prime is 86781031. The reversal of 86781029 is 92018768.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63760225 + 23020804 = 7985^2 + 4798^2 .

It is a cyclic number.

It is not a de Polignac number, because 86781029 - 2⁸ = 86780773 is a prime.

Together with 86781031, 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 (86781229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43390514 + 43390515.

It is an arithmetic number, because the mean of its divisors is an integer number (43390515).

Almost surely, 2^86781029 is an apocalyptic number.

It is an amenable number.

86781029 is a deficient number, since it is larger than the sum of its proper divisors (1).

86781029 is an equidigital number, since it uses as much as digits as its factorization.

86781029 is an evil number, because the sum of its binary digits is even.

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

The square root of 86781029 is about 9315.6335801705. The cubic root of 86781029 is about 442.7326985309.

The spelling of 86781029 in words is "eighty-six million, seven hundred eighty-one thousand, twenty-nine".