1331721346 has 16 divisors (see below), whose sum is σ = 2028686976. Its totient is φ = 655505136.

The previous prime is 1331721341. The next prime is 1331721403. The reversal of 1331721346 is 6431271331.

It is not an unprimeable number, because it can be changed into a prime (1331721341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389175 + ... + 392581.

It is an arithmetic number, because the mean of its divisors is an integer number (126792936).

Almost surely, 2^1331721346 is an apocalyptic number.

1331721346 is a deficient number, since it is larger than the sum of its proper divisors (696965630).

1331721346 is a wasteful number, since it uses less digits than its factorization.

1331721346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6393.

The product of its digits is 9072, while the sum is 31.

The square root of 1331721346 is about 36492.7574458275. The cubic root of 1331721346 is about 1100.1986820182.

Adding to 1331721346 its reverse (6431271331), we get a palindrome (7762992677).

The spelling of 1331721346 in words is "one billion, three hundred thirty-one million, seven hundred twenty-one thousand, three hundred forty-six".