86531249 has 4 divisors (see below), whose sum is σ = 98892864. Its totient is φ = 74169636.

The previous prime is 86531239. The next prime is 86531257. The reversal of 86531249 is 94213568.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86531249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86531239) 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, 6180797 + ... + 6180810.

It is an arithmetic number, because the mean of its divisors is an integer number (24723216).

Almost surely, 2^86531249 is an apocalyptic number.

It is an amenable number.

86531249 is a deficient number, since it is larger than the sum of its proper divisors (12361615).

86531249 is a wasteful number, since it uses less digits than its factorization.

86531249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12361614.

The product of its digits is 51840, while the sum is 38.

The square root of 86531249 is about 9302.2174238189. The cubic root of 86531249 is about 442.3075209562.

The spelling of 86531249 in words is "eighty-six million, five hundred thirty-one thousand, two hundred forty-nine".