61310210281 has 2 divisors, whose sum is σ = 61310210282. Its totient is φ = 61310210280.

The previous prime is 61310210279. The next prime is 61310210309. The reversal of 61310210281 is 18201201316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40585728681 + 20724481600 = 201459^2 + 143960^2 .

It is a cyclic number.

It is not a de Polignac number, because 61310210281 - 2¹ = 61310210279 is a prime.

It is a super-2 number, since 2×61310210281² (a number of 22 digits) contains 22 as substring.

Together with 61310210279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61310210581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30655105140 + 30655105141.

It is an arithmetic number, because the mean of its divisors is an integer number (30655105141).

Almost surely, 2^61310210281 is an apocalyptic number.

It is an amenable number.

61310210281 is a deficient number, since it is larger than the sum of its proper divisors (1).

61310210281 is an equidigital number, since it uses as much as digits as its factorization.

61310210281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 61310210281 its reverse (18201201316), we get a palindrome (79511411597).

The spelling of 61310210281 in words is "sixty-one billion, three hundred ten million, two hundred ten thousand, two hundred eighty-one".