121687849 has 2 divisors, whose sum is σ = 121687850. Its totient is φ = 121687848.

The previous prime is 121687829. The next prime is 121687859. The reversal of 121687849 is 948786121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102151449 + 19536400 = 10107^2 + 4420^2 .

It is a cyclic number.

It is not a de Polignac number, because 121687849 - 2⁵ = 121687817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121687799 and 121687808.

It is not a weakly prime, because it can be changed into another prime (121687829) 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 as a sum of consecutive naturals, namely, 60843924 + 60843925.

It is an arithmetic number, because the mean of its divisors is an integer number (60843925).

Almost surely, 2^121687849 is an apocalyptic number.

It is an amenable number.

121687849 is a deficient number, since it is larger than the sum of its proper divisors (1).

121687849 is an equidigital number, since it uses as much as digits as its factorization.

121687849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 46.

The square root of 121687849 is about 11031.2215552041. The cubic root of 121687849 is about 495.5442084644.

It can be divided in two parts, 12 and 1687849, that added together give a palindrome (1687861).

The spelling of 121687849 in words is "one hundred twenty-one million, six hundred eighty-seven thousand, eight hundred forty-nine".