121289239 has 2 divisors, whose sum is σ = 121289240. Its totient is φ = 121289238.

The previous prime is 121289221. The next prime is 121289249. The reversal of 121289239 is 932982121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121289239 - 2¹¹ = 121287191 is a prime.

It is a super-2 number, since 2×121289239² = 29422158994398242, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 121289198 and 121289207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121289209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60644619 + 60644620.

It is an arithmetic number, because the mean of its divisors is an integer number (60644620).

Almost surely, 2^121289239 is an apocalyptic number.

121289239 is a deficient number, since it is larger than the sum of its proper divisors (1).

121289239 is an equidigital number, since it uses as much as digits as its factorization.

121289239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 121289239 is about 11013.1393798499. The cubic root of 121289239 is about 495.0025357827.

The spelling of 121289239 in words is "one hundred twenty-one million, two hundred eighty-nine thousand, two hundred thirty-nine".