1821311703 has 8 divisors (see below), whose sum is σ = 2698239600. Its totient is φ = 1214207784.

The previous prime is 1821311683. The next prime is 1821311707. The reversal of 1821311703 is 3071131281.

It is a happy number.

It is not a de Polignac number, because 1821311703 - 2¹³ = 1821303511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 67455989 = 1821311703 / (1 + 8 + 2 + 1 + 3 + 1 + 1 + 7 + 0 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821311707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33727968 + ... + 33728021.

It is an arithmetic number, because the mean of its divisors is an integer number (337279950).

Almost surely, 2^1821311703 is an apocalyptic number.

1821311703 is a deficient number, since it is larger than the sum of its proper divisors (876927897).

1821311703 is an equidigital number, since it uses as much as digits as its factorization.

1821311703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67455998 (or 67455992 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1821311703 is about 42676.8286427190. The cubic root of 1821311703 is about 1221.2223936737. Note that the first 3 decimals are identical.

Adding to 1821311703 its reverse (3071131281), we get a palindrome (4892442984).

The spelling of 1821311703 in words is "one billion, eight hundred twenty-one million, three hundred eleven thousand, seven hundred three".