121753989 has 16 divisors (see below), whose sum is σ = 206144640. Its totient is φ = 69573600.

The previous prime is 121753967. The next prime is 121754021. The reversal of 121753989 is 989357121.

It is not a de Polignac number, because 121753989 - 2⁸ = 121753733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121753589) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321912 + ... + 322289.

It is an arithmetic number, because the mean of its divisors is an integer number (12884040).

Almost surely, 2^121753989 is an apocalyptic number.

It is an amenable number.

121753989 is a deficient number, since it is larger than the sum of its proper divisors (84390651).

121753989 is an equidigital number, since it uses as much as digits as its factorization.

121753989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644217 (or 644211 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 121753989 is about 11034.2190027206. The cubic root of 121753989 is about 495.6339718987.

The spelling of 121753989 in words is "one hundred twenty-one million, seven hundred fifty-three thousand, nine hundred eighty-nine".