1321447799 has 4 divisors (see below), whose sum is σ = 1510226064. Its totient is φ = 1132669536.

The previous prime is 1321447769. The next prime is 1321447807. The reversal of 1321447799 is 9977441231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9977441231 = 43 ⋅232033517.

It is a cyclic number.

It is not a de Polignac number, because 1321447799 - 2²⁴ = 1304670583 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 (1321447709) 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, 94389122 + ... + 94389135.

It is an arithmetic number, because the mean of its divisors is an integer number (377556516).

Almost surely, 2^1321447799 is an apocalyptic number.

1321447799 is a deficient number, since it is larger than the sum of its proper divisors (188778265).

1321447799 is an equidigital number, since it uses as much as digits as its factorization.

1321447799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188778264.

The product of its digits is 381024, while the sum is 47.

The square root of 1321447799 is about 36351.7234667079. The cubic root of 1321447799 is about 1097.3622193740.

The spelling of 1321447799 in words is "one billion, three hundred twenty-one million, four hundred forty-seven thousand, seven hundred ninety-nine".