1566491313 has 4 divisors (see below), whose sum is σ = 2088655088. Its totient is φ = 1044327540.

The previous prime is 1566491281. The next prime is 1566491363. The reversal of 1566491313 is 3131946651.

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 not a de Polignac number, because 1566491313 - 2⁵ = 1566491281 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1566491363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261081883 + ... + 261081888.

It is an arithmetic number, because the mean of its divisors is an integer number (522163772).

Almost surely, 2^1566491313 is an apocalyptic number.

It is an amenable number.

1566491313 is a deficient number, since it is larger than the sum of its proper divisors (522163775).

1566491313 is an equidigital number, since it uses as much as digits as its factorization.

1566491313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522163774.

The product of its digits is 58320, while the sum is 39.

The square root of 1566491313 is about 39578.9251117309. The cubic root of 1566491313 is about 1161.3844234246.

The spelling of 1566491313 in words is "one billion, five hundred sixty-six million, four hundred ninety-one thousand, three hundred thirteen".