1316566961 has 4 divisors (see below), whose sum is σ = 1344579072. Its totient is φ = 1288554852.

The previous prime is 1316566913. The next prime is 1316566997. The reversal of 1316566961 is 1696656131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1316566961 - 2¹⁸ = 1316304817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1316566261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14005985 + ... + 14006078.

It is an arithmetic number, because the mean of its divisors is an integer number (336144768).

Almost surely, 2^1316566961 is an apocalyptic number.

It is an amenable number.

1316566961 is a deficient number, since it is larger than the sum of its proper divisors (28012111).

1316566961 is an equidigital number, since it uses as much as digits as its factorization.

1316566961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28012110.

The product of its digits is 174960, while the sum is 44.

The square root of 1316566961 is about 36284.5278459015. The cubic root of 1316566961 is about 1096.0094972382.

The spelling of 1316566961 in words is "one billion, three hundred sixteen million, five hundred sixty-six thousand, nine hundred sixty-one".