1317705561 has 12 divisors (see below), whose sum is σ = 1964751360. Its totient is φ = 850132440.

The previous prime is 1317705559. The next prime is 1317705611. The reversal of 1317705561 is 1655077131.

1317705561 is a `hidden beast` number, since 1 + 31 + 7 + 70 + 556 + 1 = 666.

It is not a de Polignac number, because 1317705561 - 2¹ = 1317705559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1317705541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2361201 + ... + 2361758.

It is an arithmetic number, because the mean of its divisors is an integer number (163729280).

Almost surely, 2^1317705561 is an apocalyptic number.

It is an amenable number.

1317705561 is a deficient number, since it is larger than the sum of its proper divisors (647045799).

1317705561 is a wasteful number, since it uses less digits than its factorization.

1317705561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4722996 (or 4722993 counting only the distinct ones).

The product of its (nonzero) digits is 22050, while the sum is 36.

The square root of 1317705561 is about 36300.2143382102. The cubic root of 1317705561 is about 1096.3253583325.

The spelling of 1317705561 in words is "one billion, three hundred seventeen million, seven hundred five thousand, five hundred sixty-one".