1307705561 has 2 divisors, whose sum is σ = 1307705562. Its totient is φ = 1307705560.

The previous prime is 1307705521. The next prime is 1307705563. The reversal of 1307705561 is 1655077031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1278491536 + 29214025 = 35756^2 + 5405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1307705561 is a prime.

Together with 1307705563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1307705563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653852780 + 653852781.

It is an arithmetic number, because the mean of its divisors is an integer number (653852781).

Almost surely, 2^1307705561 is an apocalyptic number.

It is an amenable number.

1307705561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1307705561 is an equidigital number, since it uses as much as digits as its factorization.

1307705561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22050, while the sum is 35.

The square root of 1307705561 is about 36162.2117824671. The cubic root of 1307705561 is about 1093.5449940845.

The spelling of 1307705561 in words is "one billion, three hundred seven million, seven hundred five thousand, five hundred sixty-one".