1321724847 has 4 divisors (see below), whose sum is σ = 1762299800. Its totient is φ = 881149896.

The previous prime is 1321724837. The next prime is 1321724867. The reversal of 1321724847 is 7484271231.

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

It is not a de Polignac number, because 1321724847 - 2²³ = 1313336239 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 (1321724827) 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, 220287472 + ... + 220287477.

It is an arithmetic number, because the mean of its divisors is an integer number (440574950).

Almost surely, 2^1321724847 is an apocalyptic number.

1321724847 is a deficient number, since it is larger than the sum of its proper divisors (440574953).

1321724847 is an equidigital number, since it uses as much as digits as its factorization.

1321724847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440574952.

The product of its digits is 75264, while the sum is 39.

The square root of 1321724847 is about 36355.5339253875. The cubic root of 1321724847 is about 1097.4389031356.

The spelling of 1321724847 in words is "one billion, three hundred twenty-one million, seven hundred twenty-four thousand, eight hundred forty-seven".