121111919 has 2 divisors, whose sum is σ = 121111920. Its totient is φ = 121111918.

The previous prime is 121111897. The next prime is 121111967. The reversal of 121111919 is 919111121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121111919 is a prime.

It is a super-2 number, since 2×121111919² = 29336193847725122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121111979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555959 + 60555960.

It is an arithmetic number, because the mean of its divisors is an integer number (60555960).

Almost surely, 2^121111919 is an apocalyptic number.

121111919 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111919 is an equidigital number, since it uses as much as digits as its factorization.

121111919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 26.

The square root of 121111919 is about 11005.0860514582. The cubic root of 121111919 is about 494.7611935194.

The spelling of 121111919 in words is "one hundred twenty-one million, one hundred eleven thousand, nine hundred nineteen".