121973959 has 2 divisors, whose sum is σ = 121973960. Its totient is φ = 121973958.

The previous prime is 121973897. The next prime is 121973981. The reversal of 121973959 is 959379121.

It is a strong prime.

It is an emirp because it is prime and its reverse (959379121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121973959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121977959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60986979 + 60986980.

It is an arithmetic number, because the mean of its divisors is an integer number (60986980).

Almost surely, 2^121973959 is an apocalyptic number.

121973959 is a deficient number, since it is larger than the sum of its proper divisors (1).

121973959 is an equidigital number, since it uses as much as digits as its factorization.

121973959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 153090, while the sum is 46.

The square root of 121973959 is about 11044.1821335941. The cubic root of 121973959 is about 495.9322756453.

The spelling of 121973959 in words is "one hundred twenty-one million, nine hundred seventy-three thousand, nine hundred fifty-nine".