1331242320 has 40 divisors (see below), whose sum is σ = 4126851936. Its totient is φ = 354997888.

The previous prime is 1331242309. The next prime is 1331242357. The reversal of 1331242320 is 232421331.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1331242320² = 3544412229117964800, 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 7 ways as a sum of consecutive naturals, for example, 2773182 + ... + 2773661.

Almost surely, 2^1331242320 is an apocalyptic number.

1331242320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331242320 is an abundant number, since it is smaller than the sum of its proper divisors (2795609616).

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

1331242320 is a wasteful number, since it uses less digits than its factorization.

1331242320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5546859 (or 5546853 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 1331242320 is about 36486.1935531784. The cubic root of 1331242320 is about 1100.0667507702.

Adding to 1331242320 its reverse (232421331), we get a palindrome (1563663651).

The spelling of 1331242320 in words is "one billion, three hundred thirty-one million, two hundred forty-two thousand, three hundred twenty".