86121587 has 4 divisors (see below), whose sum is σ = 86361840. Its totient is φ = 85881336.

The previous prime is 86121571. The next prime is 86121593. The reversal of 86121587 is 78512168.

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 86121587 - 2⁴ = 86121571 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86121587.

It is not an unprimeable number, because it can be changed into a prime (86121527) 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, 119588 + ... + 120305.

It is an arithmetic number, because the mean of its divisors is an integer number (21590460).

Almost surely, 2^86121587 is an apocalyptic number.

86121587 is a deficient number, since it is larger than the sum of its proper divisors (240253).

86121587 is a wasteful number, since it uses less digits than its factorization.

86121587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240252.

The product of its digits is 26880, while the sum is 38.

The square root of 86121587 is about 9280.1717117734. The cubic root of 86121587 is about 441.6084159719.

The spelling of 86121587 in words is "eighty-six million, one hundred twenty-one thousand, five hundred eighty-seven".