842748121 has 2 divisors, whose sum is σ = 842748122. Its totient is φ = 842748120.

The previous prime is 842748119. The next prime is 842748133. The reversal of 842748121 is 121847248.

It is a happy number.

842748121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 700184521 + 142563600 = 26461^2 + 11940^2 .

It is a cyclic number.

It is not a de Polignac number, because 842748121 - 2¹ = 842748119 is a prime.

Together with 842748119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (842748721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421374060 + 421374061.

It is an arithmetic number, because the mean of its divisors is an integer number (421374061).

Almost surely, 2^842748121 is an apocalyptic number.

It is an amenable number.

842748121 is a deficient number, since it is larger than the sum of its proper divisors (1).

842748121 is an equidigital number, since it uses as much as digits as its factorization.

842748121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28672, while the sum is 37.

The square root of 842748121 is about 29030.1243710736. The cubic root of 842748121 is about 944.5666278981.

The spelling of 842748121 in words is "eight hundred forty-two million, seven hundred forty-eight thousand, one hundred twenty-one".