121589999 has 2 divisors, whose sum is σ = 121590000. Its totient is φ = 121589998.

The previous prime is 121589989. The next prime is 121590037. The reversal of 121589999 is 999985121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121589999 - 2¹⁶ = 121524463 is a prime.

It is a Sophie Germain prime.

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 121589999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121589929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60794999 + 60795000.

It is an arithmetic number, because the mean of its divisors is an integer number (60795000).

Almost surely, 2^121589999 is an apocalyptic number.

121589999 is a deficient number, since it is larger than the sum of its proper divisors (1).

121589999 is an equidigital number, since it uses as much as digits as its factorization.

121589999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 53.

The square root of 121589999 is about 11026.7855243493. The cubic root of 121589999 is about 495.4113493943.

The spelling of 121589999 in words is "one hundred twenty-one million, five hundred eighty-nine thousand, nine hundred ninety-nine".