1331643243 has 16 divisors (see below), whose sum is σ = 2029761536. Its totient is φ = 760717440.

The previous prime is 1331643241. The next prime is 1331643251. The reversal of 1331643243 is 3423461331.

It is not a de Polignac number, because 1331643243 - 2¹ = 1331643241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331643243.

It is not an unprimeable number, because it can be changed into a prime (1331643241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88830 + ... + 102732.

It is an arithmetic number, because the mean of its divisors is an integer number (126860096).

Almost surely, 2^1331643243 is an apocalyptic number.

1331643243 is a deficient number, since it is larger than the sum of its proper divisors (698118293).

1331643243 is a wasteful number, since it uses less digits than its factorization.

1331643243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18474.

The product of its digits is 15552, while the sum is 30.

The square root of 1331643243 is about 36491.6873136883. The cubic root of 1331643243 is about 1100.1771733901.

The spelling of 1331643243 in words is "one billion, three hundred thirty-one million, six hundred forty-three thousand, two hundred forty-three".