1311331201 has 4 divisors (see below), whose sum is σ = 1311521092. Its totient is φ = 1311141312.

The previous prime is 1311331199. The next prime is 1311331211. The reversal of 1311331201 is 1021331131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 626200576 + 685130625 = 25024^2 + 26175^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311331201 - 2¹ = 1311331199 is a prime.

It is a super-2 number, since 2×1311331201² = 3439179037432204802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311331211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84180 + ... + 98533.

It is an arithmetic number, because the mean of its divisors is an integer number (327880273).

Almost surely, 2^1311331201 is an apocalyptic number.

It is an amenable number.

1311331201 is a deficient number, since it is larger than the sum of its proper divisors (189891).

1311331201 is an equidigital number, since it uses as much as digits as its factorization.

1311331201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189890.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1311331201 is about 36212.3073139506. The cubic root of 1311331201 is about 1094.5546866996.

Adding to 1311331201 its reverse (1021331131), we get a palindrome (2332662332).

The spelling of 1311331201 in words is "one billion, three hundred eleven million, three hundred thirty-one thousand, two hundred one".