87812121 has 8 divisors (see below), whose sum is σ = 119574144. Its totient is φ = 57295760.

The previous prime is 87812083. The next prime is 87812147. The reversal of 87812121 is 12121878.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87812121 - 2⁷ = 87811993 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87812521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311250 + ... + 311531.

It is an arithmetic number, because the mean of its divisors is an integer number (14946768).

Almost surely, 2^87812121 is an apocalyptic number.

It is an amenable number.

87812121 is a deficient number, since it is larger than the sum of its proper divisors (31762023).

87812121 is a wasteful number, since it uses less digits than its factorization.

87812121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622831.

The product of its digits is 1792, while the sum is 30.

The square root of 87812121 is about 9370.8121846508. The cubic root of 87812121 is about 444.4792477584.

Adding to 87812121 its reverse (12121878), we get a palindrome (99933999).

The spelling of 87812121 in words is "eighty-seven million, eight hundred twelve thousand, one hundred twenty-one".