121639775 has 12 divisors (see below), whose sum is σ = 156035400. Its totient is φ = 93955680.

The previous prime is 121639751. The next prime is 121639781. The reversal of 121639775 is 577936121.

It is not a de Polignac number, because 121639775 - 2⁸ = 121639519 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83165 + ... + 84614.

It is an arithmetic number, because the mean of its divisors is an integer number (13002950).

Almost surely, 2^121639775 is an apocalyptic number.

121639775 is a deficient number, since it is larger than the sum of its proper divisors (34395625).

121639775 is a wasteful number, since it uses less digits than its factorization.

121639775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167818 (or 167813 counting only the distinct ones).

The product of its digits is 79380, while the sum is 41.

The square root of 121639775 is about 11029.0423428329. The cubic root of 121639775 is about 495.4789433063.

The spelling of 121639775 in words is "one hundred twenty-one million, six hundred thirty-nine thousand, seven hundred seventy-five".