121535539 has 2 divisors, whose sum is σ = 121535540. Its totient is φ = 121535538.

The previous prime is 121535509. The next prime is 121535551. The reversal of 121535539 is 935535121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121535539 - 2⁵ = 121535507 is a prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (121535509) 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, 60767769 + 60767770.

It is an arithmetic number, because the mean of its divisors is an integer number (60767770).

Almost surely, 2^121535539 is an apocalyptic number.

121535539 is a deficient number, since it is larger than the sum of its proper divisors (1).

121535539 is an equidigital number, since it uses as much as digits as its factorization.

121535539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20250, while the sum is 34.

The square root of 121535539 is about 11024.3158064344. The cubic root of 121535539 is about 495.3373736523.

The spelling of 121535539 in words is "one hundred twenty-one million, five hundred thirty-five thousand, five hundred thirty-nine".