121639983 has 4 divisors (see below), whose sum is σ = 162186648. Its totient is φ = 81093320.

The previous prime is 121639927. The next prime is 121639997. The reversal of 121639983 is 389936121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121639983 - 2¹⁴ = 121623599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121639183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20273328 + ... + 20273333.

It is an arithmetic number, because the mean of its divisors is an integer number (40546662).

Almost surely, 2^121639983 is an apocalyptic number.

121639983 is a deficient number, since it is larger than the sum of its proper divisors (40546665).

121639983 is an equidigital number, since it uses as much as digits as its factorization.

121639983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40546664.

The product of its digits is 69984, while the sum is 42.

The square root of 121639983 is about 11029.0517724780. The cubic root of 121639983 is about 495.4792257237.

The spelling of 121639983 in words is "one hundred twenty-one million, six hundred thirty-nine thousand, nine hundred eighty-three".