86531811 has 4 divisors (see below), whose sum is σ = 115375752. Its totient is φ = 57687872.

The previous prime is 86531801. The next prime is 86531821. The reversal of 86531811 is 11813568.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (86531801) and next prime (86531821).

It is a cyclic number.

It is not a de Polignac number, because 86531811 - 2⁵ = 86531779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86531801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14421966 + ... + 14421971.

It is an arithmetic number, because the mean of its divisors is an integer number (28843938).

Almost surely, 2^86531811 is an apocalyptic number.

86531811 is a deficient number, since it is larger than the sum of its proper divisors (28843941).

86531811 is a wasteful number, since it uses less digits than its factorization.

86531811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28843940.

The product of its digits is 5760, while the sum is 33.

The square root of 86531811 is about 9302.2476316211. The cubic root of 86531811 is about 442.3084785150.

The spelling of 86531811 in words is "eighty-six million, five hundred thirty-one thousand, eight hundred eleven".