121665143 has 2 divisors, whose sum is σ = 121665144. Its totient is φ = 121665142.

The previous prime is 121665127. The next prime is 121665149. The reversal of 121665143 is 341566121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121665143 - 2⁴ = 121665127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121665149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60832571 + 60832572.

It is an arithmetic number, because the mean of its divisors is an integer number (60832572).

Almost surely, 2^121665143 is an apocalyptic number.

121665143 is a deficient number, since it is larger than the sum of its proper divisors (1).

121665143 is an equidigital number, since it uses as much as digits as its factorization.

121665143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 121665143 is about 11030.1923373983. The cubic root of 121665143 is about 495.5133849906.

The spelling of 121665143 in words is "one hundred twenty-one million, six hundred sixty-five thousand, one hundred forty-three".