1331641272 has 64 divisors (see below), whose sum is σ = 3593832480. Its totient is φ = 408748032.

The previous prime is 1331641261. The next prime is 1331641279. The reversal of 1331641272 is 2721461331.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331641279) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130168 + ... + 140024.

Almost surely, 2^1331641272 is an apocalyptic number.

1331641272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1331641272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1796916240).

1331641272 is an abundant number, since it is smaller than the sum of its proper divisors (2262191208).

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

1331641272 is a wasteful number, since it uses less digits than its factorization.

1331641272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10312 (or 10308 counting only the distinct ones).

The product of its digits is 6048, while the sum is 30.

The square root of 1331641272 is about 36491.6603075278. The cubic root of 1331641272 is about 1100.1766305895.

The spelling of 1331641272 in words is "one billion, three hundred thirty-one million, six hundred forty-one thousand, two hundred seventy-two".