1131881326 has 4 divisors (see below), whose sum is σ = 1697821992. Its totient is φ = 565940662.

The previous prime is 1131881321. The next prime is 1131881327. The reversal of 1131881326 is 6231881311.

It is a happy number.

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

It is a super-2 number, since 2×1131881326² = 2562310672295036552, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1131881291 and 1131881300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131881321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282970330 + ... + 282970333.

It is an arithmetic number, because the mean of its divisors is an integer number (424455498).

Almost surely, 2^1131881326 is an apocalyptic number.

1131881326 is a deficient number, since it is larger than the sum of its proper divisors (565940666).

1131881326 is an equidigital number, since it uses as much as digits as its factorization.

1131881326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565940665.

The product of its digits is 6912, while the sum is 34.

The square root of 1131881326 is about 33643.4440270315. Note that the first 3 decimals coincide. The cubic root of 1131881326 is about 1042.1581558560.

The spelling of 1131881326 in words is "one billion, one hundred thirty-one million, eight hundred eighty-one thousand, three hundred twenty-six".