1331431444 has 24 divisors (see below), whose sum is σ = 2713108608. Its totient is φ = 559846560.

The previous prime is 1331431411. The next prime is 1331431487. The reversal of 1331431444 is 4441341331.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447112 + ... + 450079.

It is an arithmetic number, because the mean of its divisors is an integer number (113046192).

Almost surely, 2^1331431444 is an apocalyptic number.

1331431444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1331431444 is an abundant number, since it is smaller than the sum of its proper divisors (1381677164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1331431444 is a wasteful number, since it uses less digits than its factorization.

1331431444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897255 (or 897253 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

The square root of 1331431444 is about 36488.7851812033. The cubic root of 1331431444 is about 1100.1188422564.

Adding to 1331431444 its reverse (4441341331), we get a palindrome (5772772775).

The spelling of 1331431444 in words is "one billion, three hundred thirty-one million, four hundred thirty-one thousand, four hundred forty-four".