121129439 has 2 divisors, whose sum is σ = 121129440. Its totient is φ = 121129438.

The previous prime is 121129417. The next prime is 121129447. The reversal of 121129439 is 934921121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121129439 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121129039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60564719 + 60564720.

It is an arithmetic number, because the mean of its divisors is an integer number (60564720).

Almost surely, 2^121129439 is an apocalyptic number.

121129439 is a deficient number, since it is larger than the sum of its proper divisors (1).

121129439 is an equidigital number, since it uses as much as digits as its factorization.

121129439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 32.

The square root of 121129439 is about 11005.8820182664. The cubic root of 121129439 is about 494.7850496854.

The spelling of 121129439 in words is "one hundred twenty-one million, one hundred twenty-nine thousand, four hundred thirty-nine".