1331265643 has 12 divisors (see below), whose sum is σ = 1385611968. Its totient is φ = 1277668080.

The previous prime is 1331265641. The next prime is 1331265653. The reversal of 1331265643 is 3465621331.

It is not a de Polignac number, because 1331265643 - 2¹ = 1331265641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331265599 and 1331265608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331265641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2545180 + ... + 2545702.

It is an arithmetic number, because the mean of its divisors is an integer number (115467664).

Almost surely, 2^1331265643 is an apocalyptic number.

1331265643 is a deficient number, since it is larger than the sum of its proper divisors (54346325).

1331265643 is an frugal number, since it uses more digits than its factorization.

1331265643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234 (or 711 counting only the distinct ones).

The product of its digits is 38880, while the sum is 34.

The square root of 1331265643 is about 36486.5131658261. The cubic root of 1331265643 is about 1100.0731750219.

Adding to 1331265643 its reverse (3465621331), we get a palindrome (4796886974).

The spelling of 1331265643 in words is "one billion, three hundred thirty-one million, two hundred sixty-five thousand, six hundred forty-three".