121881839 has 2 divisors, whose sum is σ = 121881840. Its totient is φ = 121881838.

The previous prime is 121881757. The next prime is 121881841. The reversal of 121881839 is 938188121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121881839 is a prime.

Together with 121881841, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 121881796 and 121881805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121889839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60940919 + 60940920.

It is an arithmetic number, because the mean of its divisors is an integer number (60940920).

Almost surely, 2^121881839 is an apocalyptic number.

121881839 is a deficient number, since it is larger than the sum of its proper divisors (1).

121881839 is an equidigital number, since it uses as much as digits as its factorization.

121881839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 41.

The square root of 121881839 is about 11040.0108242701. The cubic root of 121881839 is about 495.8073943794.

The spelling of 121881839 in words is "one hundred twenty-one million, eight hundred eighty-one thousand, eight hundred thirty-nine".