5261742121 has 2 divisors, whose sum is σ = 5261742122. Its totient is φ = 5261742120.

The previous prime is 5261742119. The next prime is 5261742137. The reversal of 5261742121 is 1212471625.

5261742121 is digitally balanced in base 3, 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., 4550986521 + 710755600 = 67461^2 + 26660^2 .

It is a cyclic number.

It is not a de Polignac number, because 5261742121 - 2¹ = 5261742119 is a prime.

Together with 5261742119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (5261742151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630871060 + 2630871061.

It is an arithmetic number, because the mean of its divisors is an integer number (2630871061).

Almost surely, 2^5261742121 is an apocalyptic number.

It is an amenable number.

5261742121 is a deficient number, since it is larger than the sum of its proper divisors (1).

5261742121 is an equidigital number, since it uses as much as digits as its factorization.

5261742121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 5261742121 is about 72537.8668076199. The cubic root of 5261742121 is about 1739.3081012896.

The spelling of 5261742121 in words is "five billion, two hundred sixty-one million, seven hundred forty-two thousand, one hundred twenty-one".