87172133 has 4 divisors (see below), whose sum is σ = 91760160. Its totient is φ = 82584108.

The previous prime is 87172123. The next prime is 87172181. The reversal of 87172133 is 33127178.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 87172133 - 2¹⁴ = 87155749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87172133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87172103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2293985 + ... + 2294022.

It is an arithmetic number, because the mean of its divisors is an integer number (22940040).

Almost surely, 2^87172133 is an apocalyptic number.

It is an amenable number.

87172133 is a deficient number, since it is larger than the sum of its proper divisors (4588027).

87172133 is a wasteful number, since it uses less digits than its factorization.

87172133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4588026.

The product of its digits is 7056, while the sum is 32.

The square root of 87172133 is about 9336.6017908016. The cubic root of 87172133 is about 443.3968031817.

The spelling of 87172133 in words is "eighty-seven million, one hundred seventy-two thousand, one hundred thirty-three".