121813885 has 8 divisors (see below), whose sum is σ = 146404440. Its totient is φ = 97299264.

The previous prime is 121813873. The next prime is 121813897. The reversal of 121813885 is 588318121.

It is an interprime number because it is at equal distance from previous prime (121813873) and next prime (121813897).

It can be written as a sum of positive squares in 4 ways, for example, as 3678724 + 118135161 = 1918^2 + 10869^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121813885 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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15390 + ... + 21919.

It is an arithmetic number, because the mean of its divisors is an integer number (18300555).

Almost surely, 2^121813885 is an apocalyptic number.

It is an amenable number.

121813885 is a deficient number, since it is larger than the sum of its proper divisors (24590555).

121813885 is an equidigital number, since it uses as much as digits as its factorization.

121813885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37967.

The product of its digits is 15360, while the sum is 37.

The square root of 121813885 is about 11036.9327713817. The cubic root of 121813885 is about 495.7152330985.

The spelling of 121813885 in words is "one hundred twenty-one million, eight hundred thirteen thousand, eight hundred eighty-five".