121799849 has 4 divisors (see below), whose sum is σ = 128964564. Its totient is φ = 114635136.

The previous prime is 121799831. The next prime is 121799863. The reversal of 121799849 is 948997121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 948997121 = 89 ⋅10662889.

It can be written as a sum of positive squares in 2 ways, for example, as 113273449 + 8526400 = 10643^2 + 2920^2 .

It is a cyclic number.

It is not a de Polignac number, because 121799849 - 2¹⁶ = 121734313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121799797 and 121799806.

It is not an unprimeable number, because it can be changed into a prime (121799809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3582332 + ... + 3582365.

It is an arithmetic number, because the mean of its divisors is an integer number (32241141).

Almost surely, 2^121799849 is an apocalyptic number.

It is an amenable number.

121799849 is a deficient number, since it is larger than the sum of its proper divisors (7164715).

121799849 is an equidigital number, since it uses as much as digits as its factorization.

121799849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7164714.

The product of its digits is 326592, while the sum is 50.

The square root of 121799849 is about 11036.2968879964. The cubic root of 121799849 is about 495.6961927780.

The spelling of 121799849 in words is "one hundred twenty-one million, seven hundred ninety-nine thousand, eight hundred forty-nine".