1331713638 has 12 divisors (see below), whose sum is σ = 2885379588. Its totient is φ = 443904540.

The previous prime is 1331713627. The next prime is 1331713687. The reversal of 1331713638 is 8363171331.

It is a happy number.

1331713638 is a `hidden beast` number, since 1 + 3 + 3 + 1 + 7 + 13 + 638 = 666.

It is a super-2 number, since 2×1331713638² = 3546922427270390088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36992028 + ... + 36992063.

It is an arithmetic number, because the mean of its divisors is an integer number (240448299).

Almost surely, 2^1331713638 is an apocalyptic number.

1331713638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1331713638 is an abundant number, since it is smaller than the sum of its proper divisors (1553665950).

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

1331713638 is a wasteful number, since it uses less digits than its factorization.

1331713638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73984099 (or 73984096 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 1331713638 is about 36492.6518356778. The cubic root of 1331713638 is about 1100.1965593650.

Adding to 1331713638 its reverse (8363171331), we get a palindrome (9694884969).

The spelling of 1331713638 in words is "one billion, three hundred thirty-one million, seven hundred thirteen thousand, six hundred thirty-eight".