121943889 has 6 divisors (see below), whose sum is σ = 176141186. Its totient is φ = 81295920.

The previous prime is 121943879. The next prime is 121943893. The reversal of 121943889 is 988349121.

It can be written as a sum of positive squares in only one way, i.e., 107993664 + 13950225 = 10392^2 + 3735^2 .

It is not a de Polignac number, because 121943889 - 2¹⁶ = 121878353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121943879) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6774652 + ... + 6774669.

Almost surely, 2^121943889 is an apocalyptic number.

It is an amenable number.

121943889 is a deficient number, since it is larger than the sum of its proper divisors (54197297).

121943889 is a wasteful number, since it uses less digits than its factorization.

121943889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13549327 (or 13549324 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 121943889 is about 11042.8206994409. The cubic root of 121943889 is about 495.8915185600.

The spelling of 121943889 in words is "one hundred twenty-one million, nine hundred forty-three thousand, eight hundred eighty-nine".