86999121 has 18 divisors (see below), whose sum is σ = 138129810. Its totient is φ = 52726080.

The previous prime is 86999117. The next prime is 86999123. The reversal of 86999121 is 12199968.

86999121 = 475² + 476² + ... + 716².

It can be written as a sum of positive squares in only one way, i.e., 59120721 + 27878400 = 7689^2 + 5280^2 .

It is not a de Polignac number, because 86999121 - 2² = 86999117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86999123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 38856 + ... + 41033.

Almost surely, 2^86999121 is an apocalyptic number.

It is an amenable number.

86999121 is a deficient number, since it is larger than the sum of its proper divisors (51130689).

86999121 is a wasteful number, since it uses less digits than its factorization.

86999121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79917 (or 79903 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 86999121 is about 9327.3319336239. The cubic root of 86999121 is about 443.1032698690.

The spelling of 86999121 in words is "eighty-six million, nine hundred ninety-nine thousand, one hundred twenty-one".