121713989 has 4 divisors (see below), whose sum is σ = 122919180. Its totient is φ = 120508800.

The previous prime is 121713983. The next prime is 121714001. The reversal of 121713989 is 989317121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989317121 = 13 ⋅76101317.

It can be written as a sum of positive squares in 2 ways, for example, as 78021889 + 43692100 = 8833^2 + 6610^2 .

It is a cyclic number.

It is not a de Polignac number, because 121713989 - 2⁸ = 121713733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121713983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 602444 + ... + 602645.

It is an arithmetic number, because the mean of its divisors is an integer number (30729795).

Almost surely, 2^121713989 is an apocalyptic number.

It is an amenable number.

121713989 is a deficient number, since it is larger than the sum of its proper divisors (1205191).

121713989 is a wasteful number, since it uses less digits than its factorization.

121713989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205190.

The product of its digits is 27216, while the sum is 41.

The square root of 121713989 is about 11032.4063105018. The cubic root of 121713989 is about 495.5796888576.

The spelling of 121713989 in words is "one hundred twenty-one million, seven hundred thirteen thousand, nine hundred eighty-nine".