87121427 has 4 divisors (see below), whose sum is σ = 87396576. Its totient is φ = 86846280.

The previous prime is 87121387. The next prime is 87121429. The reversal of 87121427 is 72412178.

It is a happy number.

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 87121427 - 2²² = 82927123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87121393 and 87121402.

It is not an unprimeable number, because it can be changed into a prime (87121429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137099 + ... + 137732.

It is an arithmetic number, because the mean of its divisors is an integer number (21849144).

Almost surely, 2^87121427 is an apocalyptic number.

87121427 is a deficient number, since it is larger than the sum of its proper divisors (275149).

87121427 is a wasteful number, since it uses less digits than its factorization.

87121427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275148.

The product of its digits is 6272, while the sum is 32.

The square root of 87121427 is about 9333.8859538779. The cubic root of 87121427 is about 443.3108153084.

The spelling of 87121427 in words is "eighty-seven million, one hundred twenty-one thousand, four hundred twenty-seven".