1361731817 has 2 divisors, whose sum is σ = 1361731818. Its totient is φ = 1361731816.

The previous prime is 1361731771. The next prime is 1361731837. The reversal of 1361731817 is 7181371631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 913308841 + 448422976 = 30221^2 + 21176^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361731817 - 2¹⁰ = 1361730793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1361731837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680865908 + 680865909.

It is an arithmetic number, because the mean of its divisors is an integer number (680865909).

Almost surely, 2^1361731817 is an apocalyptic number.

It is an amenable number.

1361731817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361731817 is an equidigital number, since it uses as much as digits as its factorization.

1361731817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 38.

The square root of 1361731817 is about 36901.6505999393. The cubic root of 1361731817 is about 1108.4017300295.

The spelling of 1361731817 in words is "one billion, three hundred sixty-one million, seven hundred thirty-one thousand, eight hundred seventeen".