121637989 has 8 divisors (see below), whose sum is σ = 132778080. Its totient is φ = 110511600.

The previous prime is 121637983. The next prime is 121637993. The reversal of 121637989 is 989736121.

It is a happy number.

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 121637989 - 2²⁵ = 88083557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121637983) 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, 26722 + ... + 30940.

It is an arithmetic number, because the mean of its divisors is an integer number (16597260).

Almost surely, 2^121637989 is an apocalyptic number.

It is an amenable number.

121637989 is a deficient number, since it is larger than the sum of its proper divisors (11140091).

121637989 is a wasteful number, since it uses less digits than its factorization.

121637989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6851.

The product of its digits is 163296, while the sum is 46.

The square root of 121637989 is about 11028.9613744903. The cubic root of 121637989 is about 495.4765183053.

The spelling of 121637989 in words is "one hundred twenty-one million, six hundred thirty-seven thousand, nine hundred eighty-nine".