121639099 has 2 divisors, whose sum is σ = 121639100. Its totient is φ = 121639098.

The previous prime is 121639093. The next prime is 121639123. The reversal of 121639099 is 990936121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121639099 - 2⁷ = 121638971 is a prime.

It is not a weakly prime, because it can be changed into another prime (121639093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60819549 + 60819550.

It is an arithmetic number, because the mean of its divisors is an integer number (60819550).

Almost surely, 2^121639099 is an apocalyptic number.

121639099 is a deficient number, since it is larger than the sum of its proper divisors (1).

121639099 is an equidigital number, since it uses as much as digits as its factorization.

121639099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 121639099 is about 11029.0116964305. The cubic root of 121639099 is about 495.4780254476.

The spelling of 121639099 in words is "one hundred twenty-one million, six hundred thirty-nine thousand, ninety-nine".