121028651 has 4 divisors (see below), whose sum is σ = 127398600. Its totient is φ = 114658704.

The previous prime is 121028639. The next prime is 121028669. The reversal of 121028651 is 156820121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121028651 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 121028651.

It is not an unprimeable number, because it can be changed into a prime (121028251) 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, 3184946 + ... + 3184983.

It is an arithmetic number, because the mean of its divisors is an integer number (31849650).

Almost surely, 2^121028651 is an apocalyptic number.

121028651 is a deficient number, since it is larger than the sum of its proper divisors (6369949).

121028651 is an equidigital number, since it uses as much as digits as its factorization.

121028651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6369948.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 121028651 is about 11001.3022410986. The cubic root of 121028651 is about 494.6477799083.

Adding to 121028651 its reverse (156820121), we get a palindrome (277848772).

The spelling of 121028651 in words is "one hundred twenty-one million, twenty-eight thousand, six hundred fifty-one".