86121987 has 16 divisors (see below), whose sum is σ = 131400192. Its totient is φ = 49150080.

The previous prime is 86121961. The next prime is 86122009. The reversal of 86121987 is 78912168.

It is not a de Polignac number, because 86121987 - 2¹¹ = 86119939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86121487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18187 + ... + 22427.

It is an arithmetic number, because the mean of its divisors is an integer number (8212512).

Almost surely, 2^86121987 is an apocalyptic number.

86121987 is a deficient number, since it is larger than the sum of its proper divisors (45278205).

86121987 is a wasteful number, since it uses less digits than its factorization.

86121987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5218.

The product of its digits is 48384, while the sum is 42.

The square root of 86121987 is about 9280.1932630738. The cubic root of 86121987 is about 441.6090996684.

The spelling of 86121987 in words is "eighty-six million, one hundred twenty-one thousand, nine hundred eighty-seven".