87133971 has 4 divisors (see below), whose sum is σ = 116178632. Its totient is φ = 58089312.

The previous prime is 87133939. The next prime is 87134011. The reversal of 87133971 is 17933178.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 87133971 - 2⁵ = 87133939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87133171) 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, 14522326 + ... + 14522331.

It is an arithmetic number, because the mean of its divisors is an integer number (29044658).

Almost surely, 2^87133971 is an apocalyptic number.

87133971 is a deficient number, since it is larger than the sum of its proper divisors (29044661).

87133971 is a wasteful number, since it uses less digits than its factorization.

87133971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29044660.

The product of its digits is 31752, while the sum is 39.

The square root of 87133971 is about 9334.5578899057. The cubic root of 87133971 is about 443.3320906869.

The spelling of 87133971 in words is "eighty-seven million, one hundred thirty-three thousand, nine hundred seventy-one".