121989141 has 6 divisors (see below), whose sum is σ = 176206550. Its totient is φ = 81326088.

The previous prime is 121989121. The next prime is 121989143. The reversal of 121989141 is 141989121.

It can be written as a sum of positive squares in only one way, i.e., 119574225 + 2414916 = 10935^2 + 1554^2 .

It is a de Polignac number, because none of the positive numbers 2^k-121989141 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121989096 and 121989105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121989143) 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, 6777166 + ... + 6777183.

Almost surely, 2^121989141 is an apocalyptic number.

It is an amenable number.

121989141 is a deficient number, since it is larger than the sum of its proper divisors (54217409).

121989141 is a wasteful number, since it uses less digits than its factorization.

121989141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13554355 (or 13554352 counting only the distinct ones).

The product of its digits is 5184, while the sum is 36.

The square root of 121989141 is about 11044.8694424153. The cubic root of 121989141 is about 495.9528508880.

The spelling of 121989141 in words is "one hundred twenty-one million, nine hundred eighty-nine thousand, one hundred forty-one".