121435439 has 2 divisors, whose sum is σ = 121435440. Its totient is φ = 121435438.

The previous prime is 121435429. The next prime is 121435453. The reversal of 121435439 is 934534121.

It is a weak prime.

It is an emirp because it is prime and its reverse (934534121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121435439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121435429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60717719 + 60717720.

It is an arithmetic number, because the mean of its divisors is an integer number (60717720).

Almost surely, 2^121435439 is an apocalyptic number.

121435439 is a deficient number, since it is larger than the sum of its proper divisors (1).

121435439 is an equidigital number, since it uses as much as digits as its factorization.

121435439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 121435439 is about 11019.7749069570. The cubic root of 121435439 is about 495.2013451554.

The spelling of 121435439 in words is "one hundred twenty-one million, four hundred thirty-five thousand, four hundred thirty-nine".