121849187 has 4 divisors (see below), whose sum is σ = 122283096. Its totient is φ = 121415280.

The previous prime is 121849181. The next prime is 121849201. The reversal of 121849187 is 781948121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 781948121 = 37 ⋅21133733.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121849187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121849181) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 216533 + ... + 217094.

It is an arithmetic number, because the mean of its divisors is an integer number (30570774).

Almost surely, 2^121849187 is an apocalyptic number.

121849187 is a deficient number, since it is larger than the sum of its proper divisors (433909).

121849187 is an equidigital number, since it uses as much as digits as its factorization.

121849187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433908.

The product of its digits is 32256, while the sum is 41.

The square root of 121849187 is about 11038.5319223165. The cubic root of 121849187 is about 495.7631150209.

It can be divided in two parts, 1218 and 49187, that added together give a palindrome (50405).

The spelling of 121849187 in words is "one hundred twenty-one million, eight hundred forty-nine thousand, one hundred eighty-seven".