1321566445131 has 4 divisors (see below), whose sum is σ = 1762088593512. Its totient is φ = 881044296752.

The previous prime is 1321566445123. The next prime is 1321566445159. The reversal of 1321566445131 is 1315446651231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1321566445131 - 2³ = 1321566445123 is a prime.

It is a super-2 number, since 2×1321566445131² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1321566445231) 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, 220261074186 + ... + 220261074191.

It is an arithmetic number, because the mean of its divisors is an integer number (440522148378).

Almost surely, 2^{1321566445131} is an apocalyptic number.

1321566445131 is a deficient number, since it is larger than the sum of its proper divisors (440522148381).

1321566445131 is an equidigital number, since it uses as much as digits as its factorization.

1321566445131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440522148380.

The product of its digits is 259200, while the sum is 42.

The spelling of 1321566445131 in words is "one trillion, three hundred twenty-one billion, five hundred sixty-six million, four hundred forty-five thousand, one hundred thirty-one".