61310718121 has 2 divisors, whose sum is σ = 61310718122. Its totient is φ = 61310718120.

The previous prime is 61310718031. The next prime is 61310718137. The reversal of 61310718121 is 12181701316.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60203492496 + 1107225625 = 245364^2 + 33275^2 .

It is a cyclic number.

It is not a de Polignac number, because 61310718121 - 2²⁷ = 61176500393 is a prime.

It is not a weakly prime, because it can be changed into another prime (61310718181) 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, 30655359060 + 30655359061.

It is an arithmetic number, because the mean of its divisors is an integer number (30655359061).

Almost surely, 2^61310718121 is an apocalyptic number.

It is an amenable number.

61310718121 is a deficient number, since it is larger than the sum of its proper divisors (1).

61310718121 is an equidigital number, since it uses as much as digits as its factorization.

61310718121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 31.

The spelling of 61310718121 in words is "sixty-one billion, three hundred ten million, seven hundred eighteen thousand, one hundred twenty-one".