288772121 has 4 divisors (see below), whose sum is σ = 315024144. Its totient is φ = 262520100.

The previous prime is 288772117. The next prime is 288772129. The reversal of 288772121 is 121277882.

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 a cyclic number.

It is not a de Polignac number, because 288772121 - 2² = 288772117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (288772129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13125995 + ... + 13126016.

It is an arithmetic number, because the mean of its divisors is an integer number (78756036).

Almost surely, 2^288772121 is an apocalyptic number.

It is an amenable number.

288772121 is a deficient number, since it is larger than the sum of its proper divisors (26252023).

288772121 is a wasteful number, since it uses less digits than its factorization.

288772121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26252022.

The product of its digits is 25088, while the sum is 38.

The square root of 288772121 is about 16993.2963547394. The cubic root of 288772121 is about 660.9750822756.

The spelling of 288772121 in words is "two hundred eighty-eight million, seven hundred seventy-two thousand, one hundred twenty-one".