121587539 has 2 divisors, whose sum is σ = 121587540. Its totient is φ = 121587538.

The previous prime is 121587497. The next prime is 121587541. The reversal of 121587539 is 935785121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121587539 - 2⁸ = 121587283 is a prime.

Together with 121587541, 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 = 121587496 and 121587505.

It is not a weakly prime, because it can be changed into another prime (121587589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60793769 + 60793770.

It is an arithmetic number, because the mean of its divisors is an integer number (60793770).

Almost surely, 2^121587539 is an apocalyptic number.

121587539 is a deficient number, since it is larger than the sum of its proper divisors (1).

121587539 is an equidigital number, since it uses as much as digits as its factorization.

121587539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 41.

The square root of 121587539 is about 11026.6739772245. The cubic root of 121587539 is about 495.4080083297.

The spelling of 121587539 in words is "one hundred twenty-one million, five hundred eighty-seven thousand, five hundred thirty-nine".