87863121 has 12 divisors (see below), whose sum is σ = 127220340. Its totient is φ = 58433760.

The previous prime is 87863107. The next prime is 87863137. The reversal of 87863121 is 12136878.

It can be written as a sum of positive squares in 2 ways, for example, as 16646400 + 71216721 = 4080^2 + 8439^2 .

It is not a de Polignac number, because 87863121 - 2⁷ = 87862993 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (87863161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7806 + ... + 15383.

It is an arithmetic number, because the mean of its divisors is an integer number (10601695).

Almost surely, 2^87863121 is an apocalyptic number.

It is an amenable number.

87863121 is a deficient number, since it is larger than the sum of its proper divisors (39357219).

87863121 is a wasteful number, since it uses less digits than its factorization.

87863121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23616 (or 23613 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 87863121 is about 9373.5330052227. The cubic root of 87863121 is about 444.5652801280.

Adding to 87863121 its reverse (12136878), we get a palindrome (99999999).

The spelling of 87863121 in words is "eighty-seven million, eight hundred sixty-three thousand, one hundred twenty-one".