121456989 has 24 divisors (see below), whose sum is σ = 182538720. Its totient is φ = 80703216.

The previous prime is 121456981. The next prime is 121457003. The reversal of 121456989 is 989654121.

121456989 is a `hidden beast` number, since 1 + 2 + 1 + 4 + 569 + 89 = 666.

It is not a de Polignac number, because 121456989 - 2³ = 121456981 is a prime.

It is a super-2 number, since 2×121456989² = 29503600353892242, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121456981) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95842 + ... + 97100.

It is an arithmetic number, because the mean of its divisors is an integer number (7605780).

Almost surely, 2^121456989 is an apocalyptic number.

It is an amenable number.

121456989 is a deficient number, since it is larger than the sum of its proper divisors (61081731).

121456989 is an equidigital number, since it uses as much as digits as its factorization.

121456989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671 (or 1659 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 121456989 is about 11020.7526512485. The cubic root of 121456989 is about 495.2306363241.

The spelling of 121456989 in words is "one hundred twenty-one million, four hundred fifty-six thousand, nine hundred eighty-nine".