121628251 has 6 divisors (see below), whose sum is σ = 129204020. Its totient is φ = 114473376.

The previous prime is 121628231. The next prime is 121628261. The reversal of 121628251 is 152826121.

It is not a de Polignac number, because 121628251 - 2¹⁵ = 121595483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121628231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 210141 + ... + 210718.

Almost surely, 2^121628251 is an apocalyptic number.

121628251 is a deficient number, since it is larger than the sum of its proper divisors (7575769).

121628251 is an equidigital number, since it uses as much as digits as its factorization.

121628251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420893 (or 420876 counting only the distinct ones).

The product of its digits is 1920, while the sum is 28.

The square root of 121628251 is about 11028.5198916264. The cubic root of 121628251 is about 495.4632957939.

The spelling of 121628251 in words is "one hundred twenty-one million, six hundred twenty-eight thousand, two hundred fifty-one".