61731177317 has 2 divisors, whose sum is σ = 61731177318. Its totient is φ = 61731177316.

The previous prime is 61731177199. The next prime is 61731177341. The reversal of 61731177317 is 71377113716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55184587396 + 6546589921 = 234914^2 + 80911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61731177317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61731177367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30865588658 + 30865588659.

It is an arithmetic number, because the mean of its divisors is an integer number (30865588659).

Almost surely, 2^61731177317 is an apocalyptic number.

It is an amenable number.

61731177317 is a deficient number, since it is larger than the sum of its proper divisors (1).

61731177317 is an equidigital number, since it uses as much as digits as its factorization.

61731177317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129654, while the sum is 44.

The spelling of 61731177317 in words is "sixty-one billion, seven hundred thirty-one million, one hundred seventy-seven thousand, three hundred seventeen".