121028689 has 8 divisors (see below), whose sum is σ = 127507040. Its totient is φ = 114561216.

The previous prime is 121028683. The next prime is 121028693. The reversal of 121028689 is 986820121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121028689 - 2²¹ = 118931537 is a prime.

It is a super-2 number, since 2×121028689² = 29295887122117442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121028683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30889 + ... + 34585.

It is an arithmetic number, because the mean of its divisors is an integer number (15938380).

Almost surely, 2^121028689 is an apocalyptic number.

121028689 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

121028689 is a deficient number, since it is larger than the sum of its proper divisors (6478351).

121028689 is a wasteful number, since it uses less digits than its factorization.

121028689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5439.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 121028689 is about 11001.3039681667. The cubic root of 121028689 is about 494.6478316773.

The spelling of 121028689 in words is "one hundred twenty-one million, twenty-eight thousand, six hundred eighty-nine".