86991524 has 6 divisors (see below), whose sum is σ = 152235174. Its totient is φ = 43495760.

The previous prime is 86991511. The next prime is 86991529. The reversal of 86991524 is 42519968.

It can be written as a sum of positive squares in only one way, i.e., 49561600 + 37429924 = 7040^2 + 6118^2 .

It is not an unprimeable number, because it can be changed into a prime (86991529) 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, 10873937 + ... + 10873944.

It is an arithmetic number, because the mean of its divisors is an integer number (25372529).

Almost surely, 2^86991524 is an apocalyptic number.

It is an amenable number.

86991524 is a deficient number, since it is larger than the sum of its proper divisors (65243650).

86991524 is a wasteful number, since it uses less digits than its factorization.

86991524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21747885 (or 21747883 counting only the distinct ones).

The product of its digits is 155520, while the sum is 44.

The square root of 86991524 is about 9326.9246807294. The cubic root of 86991524 is about 443.0903718324.

The spelling of 86991524 in words is "eighty-six million, nine hundred ninety-one thousand, five hundred twenty-four".