1001331243 has 24 divisors (see below), whose sum is σ = 1646461440. Its totient is φ = 580480560.

The previous prime is 1001331223. The next prime is 1001331251. The reversal of 1001331243 is 3421331001.

It is not a de Polignac number, because 1001331243 - 2⁵ = 1001331211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001331203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 217603 + ... + 222156.

It is an arithmetic number, because the mean of its divisors is an integer number (68602560).

Almost surely, 2^1001331243 is an apocalyptic number.

1001331243 is a deficient number, since it is larger than the sum of its proper divisors (645130197).

1001331243 is a wasteful number, since it uses less digits than its factorization.

1001331243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439799 (or 439796 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1001331243 is about 31643.8184010716. The cubic root of 1001331243 is about 1000.4435509002.

Adding to 1001331243 its reverse (3421331001), we get a palindrome (4422662244).

The spelling of 1001331243 in words is "one billion, one million, three hundred thirty-one thousand, two hundred forty-three".