61389321317 has 2 divisors, whose sum is σ = 61389321318. Its totient is φ = 61389321316.

The previous prime is 61389321313. The next prime is 61389321397. The reversal of 61389321317 is 71312398316.

61389321317 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., 35959916161 + 25429405156 = 189631^2 + 159466^2 .

It is a cyclic number.

It is not a de Polignac number, because 61389321317 - 2² = 61389321313 is a prime.

It is a super-2 number, since 2×61389321317² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61389321313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30694660658 + 30694660659.

It is an arithmetic number, because the mean of its divisors is an integer number (30694660659).

Almost surely, 2^61389321317 is an apocalyptic number.

It is an amenable number.

61389321317 is a deficient number, since it is larger than the sum of its proper divisors (1).

61389321317 is an equidigital number, since it uses as much as digits as its factorization.

61389321317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 44.

The spelling of 61389321317 in words is "sixty-one billion, three hundred eighty-nine million, three hundred twenty-one thousand, three hundred seventeen".