121798847 has 4 divisors (see below), whose sum is σ = 121875336. Its totient is φ = 121722360.

The previous prime is 121798843. The next prime is 121798861. The reversal of 121798847 is 748897121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 748897121 = 7 ⋅106985303.

It is a cyclic number.

It is not a de Polignac number, because 121798847 - 2² = 121798843 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121798843) 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, 35804 + ... + 39057.

It is an arithmetic number, because the mean of its divisors is an integer number (30468834).

Almost surely, 2^121798847 is an apocalyptic number.

121798847 is a deficient number, since it is larger than the sum of its proper divisors (76489).

121798847 is an equidigital number, since it uses as much as digits as its factorization.

121798847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76488.

The product of its digits is 225792, while the sum is 47.

The square root of 121798847 is about 11036.2514922414. The cubic root of 121798847 is about 495.6948334743.

The spelling of 121798847 in words is "one hundred twenty-one million, seven hundred ninety-eight thousand, eight hundred forty-seven".