121691583 has 24 divisors (see below), whose sum is σ = 189959952. Its totient is φ = 74625408.

The previous prime is 121691573. The next prime is 121691611. The reversal of 121691583 is 385196121.

121691583 is a `hidden beast` number, since 12 + 1 + 69 + 1 + 583 = 666.

It is not a de Polignac number, because 121691583 - 2⁶ = 121691519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121691573) 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 in 23 ways as a sum of consecutive naturals, for example, 34960 + ... + 38282.

It is an arithmetic number, because the mean of its divisors is an integer number (7914998).

Almost surely, 2^121691583 is an apocalyptic number.

121691583 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121691583 is a deficient number, since it is larger than the sum of its proper divisors (68268369).

121691583 is a wasteful number, since it uses less digits than its factorization.

121691583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3655 (or 3652 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 121691583 is about 11031.3908008011. The cubic root of 121691583 is about 495.5492770153.

The spelling of 121691583 in words is "one hundred twenty-one million, six hundred ninety-one thousand, five hundred eighty-three".