1261617713 has 2 divisors, whose sum is σ = 1261617714. Its totient is φ = 1261617712.

The previous prime is 1261617697. The next prime is 1261617737. The reversal of 1261617713 is 3177161621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1130102689 + 131515024 = 33617^2 + 11468^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261617713 - 2⁴ = 1261617697 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1261614713) 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, 630808856 + 630808857.

It is an arithmetic number, because the mean of its divisors is an integer number (630808857).

Almost surely, 2^1261617713 is an apocalyptic number.

It is an amenable number.

1261617713 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261617713 is an equidigital number, since it uses as much as digits as its factorization.

1261617713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 35.

The square root of 1261617713 is about 35519.2583396669. The cubic root of 1261617713 is about 1080.5443395087.

The spelling of 1261617713 in words is "one billion, two hundred sixty-one million, six hundred seventeen thousand, seven hundred thirteen".