1383009732721 has 4 divisors (see below), whose sum is σ = 1383094862500. Its totient is φ = 1382924602944.

The previous prime is 1383009732683. The next prime is 1383009732743. The reversal of 1383009732721 is 1272379003831.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1147178092096 + 235831640625 = 1071064^2 + 485625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1383009732721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1383009732121) 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, 42540516 + ... + 42573013.

It is an arithmetic number, because the mean of its divisors is an integer number (345773715625).

Almost surely, 2^{1383009732721} is an apocalyptic number.

It is an amenable number.

1383009732721 is a deficient number, since it is larger than the sum of its proper divisors (85129779).

1383009732721 is an equidigital number, since it uses as much as digits as its factorization.

1383009732721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85129778.

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 1383009732721 in words is "one trillion, three hundred eighty-three billion, nine million, seven hundred thirty-two thousand, seven hundred twenty-one".