86921811 has 12 divisors (see below), whose sum is σ = 126249760. Its totient is φ = 57626640.

The previous prime is 86921801. The next prime is 86921839. The reversal of 86921811 is 11812968.

It is not a de Polignac number, because 86921811 - 2⁹ = 86921299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86921801) 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 in 11 ways as a sum of consecutive naturals, for example, 25051 + ... + 28308.

Almost surely, 2^86921811 is an apocalyptic number.

86921811 is a deficient number, since it is larger than the sum of its proper divisors (39327949).

86921811 is a wasteful number, since it uses less digits than its factorization.

86921811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53546 (or 53543 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 86921811 is about 9323.1867405947. The cubic root of 86921811 is about 442.9719794013.

The spelling of 86921811 in words is "eighty-six million, nine hundred twenty-one thousand, eight hundred eleven".