86109731 has 2 divisors, whose sum is σ = 86109732. Its totient is φ = 86109730.

The previous prime is 86109707. The next prime is 86109739. The reversal of 86109731 is 13790168.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86109731 - 2²⁶ = 19000867 is a prime.

It is a super-2 number, since 2×86109731² = 14829771545784722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 86109691 and 86109700.

It is not a weakly prime, because it can be changed into another prime (86109739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43054865 + 43054866.

It is an arithmetic number, because the mean of its divisors is an integer number (43054866).

Almost surely, 2^86109731 is an apocalyptic number.

86109731 is a deficient number, since it is larger than the sum of its proper divisors (1).

86109731 is an equidigital number, since it uses as much as digits as its factorization.

86109731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 86109731 is about 9279.5329085035. The cubic root of 86109731 is about 441.5881502451.

Adding to 86109731 its reverse (13790168), we get a palindrome (99899899).

The spelling of 86109731 in words is "eighty-six million, one hundred nine thousand, seven hundred thirty-one".