1321836487 has 4 divisors (see below), whose sum is σ = 1321909360. Its totient is φ = 1321763616.

The previous prime is 1321836457. The next prime is 1321836491. The reversal of 1321836487 is 7846381231.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7846381231 = 13 ⋅603567787.

It is a cyclic number.

It is not a de Polignac number, because 1321836487 - 2²³ = 1313447879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321836437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14623 + ... + 53455.

It is an arithmetic number, because the mean of its divisors is an integer number (330477340).

Almost surely, 2^1321836487 is an apocalyptic number.

1321836487 is a deficient number, since it is larger than the sum of its proper divisors (72873).

1321836487 is an equidigital number, since it uses as much as digits as its factorization.

1321836487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72872.

The product of its digits is 193536, while the sum is 43.

The square root of 1321836487 is about 36357.0692850785. The cubic root of 1321836487 is about 1097.4698007994.

The spelling of 1321836487 in words is "one billion, three hundred twenty-one million, eight hundred thirty-six thousand, four hundred eighty-seven".