121691799 has 24 divisors (see below), whose sum is σ = 179536032. Its totient is φ = 79410240.

The previous prime is 121691783. The next prime is 121691821. The reversal of 121691799 is 997196121.

It is not a de Polignac number, because 121691799 - 2⁴ = 121691783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121690799) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99717 + ... + 100929.

It is an arithmetic number, because the mean of its divisors is an integer number (7480668).

Almost surely, 2^121691799 is an apocalyptic number.

121691799 is a deficient number, since it is larger than the sum of its proper divisors (57844233).

121691799 is a wasteful number, since it uses less digits than its factorization.

121691799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447 (or 1444 counting only the distinct ones).

The product of its digits is 61236, while the sum is 45.

The square root of 121691799 is about 11031.4005910401. The cubic root of 121691799 is about 495.5495702116.

The spelling of 121691799 in words is "one hundred twenty-one million, six hundred ninety-one thousand, seven hundred ninety-nine".