86311831 has 4 divisors (see below), whose sum is σ = 86794200. Its totient is φ = 85829464.

The previous prime is 86311817. The next prime is 86311853. The reversal of 86311831 is 13811368.

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

It is a cyclic number.

It is not a de Polignac number, because 86311831 - 2¹³ = 86303639 is a prime.

It is a super-2 number, since 2×86311831² = 14899464341145122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 86311793 and 86311802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86311231) 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, 240916 + ... + 241273.

It is an arithmetic number, because the mean of its divisors is an integer number (21698550).

Almost surely, 2^86311831 is an apocalyptic number.

86311831 is a deficient number, since it is larger than the sum of its proper divisors (482369).

86311831 is a wasteful number, since it uses less digits than its factorization.

86311831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482368.

The product of its digits is 3456, while the sum is 31.

The square root of 86311831 is about 9290.4160832548. The cubic root of 86311831 is about 441.9333502419.

The spelling of 86311831 in words is "eighty-six million, three hundred eleven thousand, eight hundred thirty-one".