1331323131 has 4 divisors (see below), whose sum is σ = 1775097512. Its totient is φ = 887548752.

The previous prime is 1331323127. The next prime is 1331323151. The reversal of 1331323131 is 1313231331.

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

It is not a de Polignac number, because 1331323131 - 2² = 1331323127 is a prime.

It is a super-2 number, since 2×1331323131² = 3544842558271286322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331323098 and 1331323107.

It is not an unprimeable number, because it can be changed into a prime (1331323111) 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, 221887186 + ... + 221887191.

It is an arithmetic number, because the mean of its divisors is an integer number (443774378).

Almost surely, 2^1331323131 is an apocalyptic number.

1331323131 is a deficient number, since it is larger than the sum of its proper divisors (443774381).

1331323131 is an equidigital number, since it uses as much as digits as its factorization.

1331323131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443774380.

The product of its digits is 486, while the sum is 21.

The square root of 1331323131 is about 36487.3009552639. The cubic root of 1331323131 is about 1100.0890096018.

Adding to 1331323131 its reverse (1313231331), we get a palindrome (2644554462).

The spelling of 1331323131 in words is "one billion, three hundred thirty-one million, three hundred twenty-three thousand, one hundred thirty-one".