121989471 has 8 divisors (see below), whose sum is σ = 163689264. Its totient is φ = 80808000.

The previous prime is 121989463. The next prime is 121989479. The reversal of 121989471 is 174989121.

It is an interprime number because it is at equal distance from previous prime (121989463) and next prime (121989479).

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

It is not a de Polignac number, because 121989471 - 2³ = 121989463 is a prime.

It is a super-3 number, since 3×121989471³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121989479) 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, 129030 + ... + 129971.

It is an arithmetic number, because the mean of its divisors is an integer number (20461158).

Almost surely, 2^121989471 is an apocalyptic number.

121989471 is a deficient number, since it is larger than the sum of its proper divisors (41699793).

121989471 is a wasteful number, since it uses less digits than its factorization.

121989471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259161.

The product of its digits is 36288, while the sum is 42.

The square root of 121989471 is about 11044.8843814682. The cubic root of 121989471 is about 495.9532980981.

The spelling of 121989471 in words is "one hundred twenty-one million, nine hundred eighty-nine thousand, four hundred seventy-one".