121128775 has 6 divisors (see below), whose sum is σ = 150199712. Its totient is φ = 96903000.

The previous prime is 121128739. The next prime is 121128803. The reversal of 121128775 is 577821121.

It is not a de Polignac number, because 121128775 - 2⁹ = 121128263 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121128775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2422551 + ... + 2422600.

Almost surely, 2^121128775 is an apocalyptic number.

121128775 is a deficient number, since it is larger than the sum of its proper divisors (29070937).

121128775 is an equidigital number, since it uses as much as digits as its factorization.

121128775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4845161 (or 4845156 counting only the distinct ones).

The product of its digits is 7840, while the sum is 34.

The square root of 121128775 is about 11005.8518525374. The cubic root of 121128775 is about 494.7841455896.

Adding to 121128775 its reverse (577821121), we get a palindrome (698949896).

The spelling of 121128775 in words is "one hundred twenty-one million, one hundred twenty-eight thousand, seven hundred seventy-five".