121111559 has 2 divisors, whose sum is σ = 121111560. Its totient is φ = 121111558.

The previous prime is 121111493. The next prime is 121111561. The reversal of 121111559 is 955111121.

It is a strong prime.

It is an emirp because it is prime and its reverse (955111121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121111559 is a prime.

Together with 121111561, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121111259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555779 + 60555780.

It is an arithmetic number, because the mean of its divisors is an integer number (60555780).

Almost surely, 2^121111559 is an apocalyptic number.

121111559 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111559 is an equidigital number, since it uses as much as digits as its factorization.

121111559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 450, while the sum is 26.

The square root of 121111559 is about 11005.0696953722. The cubic root of 121111559 is about 494.7607033000.

The spelling of 121111559 in words is "one hundred twenty-one million, one hundred eleven thousand, five hundred fifty-nine".