288172091 has 4 divisors (see below), whose sum is σ = 289764384. Its totient is φ = 286579800.

The previous prime is 288172051. The next prime is 288172103. The reversal of 288172091 is 190271882.

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 288172091 - 2²² = 283977787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (288172051) 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, 795875 + ... + 796236.

It is an arithmetic number, because the mean of its divisors is an integer number (72441096).

Almost surely, 2^288172091 is an apocalyptic number.

288172091 is a deficient number, since it is larger than the sum of its proper divisors (1592293).

288172091 is a wasteful number, since it uses less digits than its factorization.

288172091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592292.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 288172091 is about 16975.6322709936. The cubic root of 288172091 is about 660.5169587650.

The spelling of 288172091 in words is "two hundred eighty-eight million, one hundred seventy-two thousand, ninety-one".