1331315444 has 12 divisors (see below), whose sum is σ = 2330170500. Its totient is φ = 665552448.

The previous prime is 1331315443. The next prime is 1331315449. The reversal of 1331315444 is 4445131331.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1015187044 + 316128400 = 31862^2 + 17780^2 .

It is a super-2 number, since 2×1331315444² = 3544801622865834272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331315443) 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, 6752 + ... + 52040.

It is an arithmetic number, because the mean of its divisors is an integer number (194180875).

Almost surely, 2^1331315444 is an apocalyptic number.

It is an amenable number.

1331315444 is a deficient number, since it is larger than the sum of its proper divisors (998855056).

1331315444 is a wasteful number, since it uses less digits than its factorization.

1331315444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52642 (or 52640 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 1331315444 is about 36487.1956170929. The cubic root of 1331315444 is about 1100.0868923095.

Adding to 1331315444 its reverse (4445131331), we get a palindrome (5776446775).

The spelling of 1331315444 in words is "one billion, three hundred thirty-one million, three hundred fifteen thousand, four hundred forty-four".