1828731321 has 6 divisors (see below), whose sum is σ = 2641500810. Its totient is φ = 1219154208.

The previous prime is 1828731287. The next prime is 1828731337. The reversal of 1828731321 is 1231378281.

It can be written as a sum of positive squares in only one way, i.e., 940035600 + 888695721 = 30660^2 + 29811^2 .

It is not a de Polignac number, because 1828731321 - 2²¹ = 1826634169 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1828731221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 101596176 + ... + 101596193.

It is an arithmetic number, because the mean of its divisors is an integer number (440250135).

Almost surely, 2^1828731321 is an apocalyptic number.

It is an amenable number.

1828731321 is a deficient number, since it is larger than the sum of its proper divisors (812769489).

1828731321 is a wasteful number, since it uses less digits than its factorization.

1828731321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203192375 (or 203192372 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 1828731321 is about 42763.6682360155. The cubic root of 1828731321 is about 1222.8784761629.

The spelling of 1828731321 in words is "one billion, eight hundred twenty-eight million, seven hundred thirty-one thousand, three hundred twenty-one".