121808959 has 2 divisors, whose sum is σ = 121808960. Its totient is φ = 121808958.

The previous prime is 121808941. The next prime is 121808971. The reversal of 121808959 is 959808121.

It is a strong prime.

It is an emirp because it is prime and its reverse (959808121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121808959 - 2¹¹ = 121806911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121808059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60904479 + 60904480.

It is an arithmetic number, because the mean of its divisors is an integer number (60904480).

Almost surely, 2^121808959 is an apocalyptic number.

121808959 is a deficient number, since it is larger than the sum of its proper divisors (1).

121808959 is an equidigital number, since it uses as much as digits as its factorization.

121808959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 43.

The square root of 121808959 is about 11036.7096092993. The cubic root of 121808959 is about 495.7085509754.

The spelling of 121808959 in words is "one hundred twenty-one million, eight hundred eight thousand, nine hundred fifty-nine".