1001311331 has 4 divisors (see below), whose sum is σ = 1001431464. Its totient is φ = 1001191200.

The previous prime is 1001311291. The next prime is 1001311349. The reversal of 1001311331 is 1331131001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1001311331 - 2¹⁸ = 1001049187 is a prime.

It is a super-2 number, since 2×1001311331² = 2005248763177983122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001361331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46550 + ... + 64571.

It is an arithmetic number, because the mean of its divisors is an integer number (250357866).

Almost surely, 2^1001311331 is an apocalyptic number.

1001311331 is a deficient number, since it is larger than the sum of its proper divisors (120133).

1001311331 is an equidigital number, since it uses as much as digits as its factorization.

1001311331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120132.

The product of its (nonzero) digits is 27, while the sum is 14.

The square root of 1001311331 is about 31643.5037724965. The cubic root of 1001311331 is about 1000.4369194070.

Adding to 1001311331 its reverse (1331131001), we get a palindrome (2332442332).

The spelling of 1001311331 in words is "one billion, one million, three hundred eleven thousand, three hundred thirty-one".