1131323131 has 6 divisors (see below), whose sum is σ = 1136754996. Its totient is φ = 1125917100.

The previous prime is 1131323113. The next prime is 1131323161. The reversal of 1131323131 is 1313231311.

It is not a de Polignac number, because 1131323131 - 2¹⁷ = 1131192059 is a prime.

It is a super-2 number, since 2×1131323131² = 2559784053471286322, 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 = 1131323099 and 1131323108.

It is not an unprimeable number, because it can be changed into a prime (1131323101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31816 + ... + 57226.

It is an arithmetic number, because the mean of its divisors is an integer number (189459166).

Almost surely, 2^1131323131 is an apocalyptic number.

1131323131 is a deficient number, since it is larger than the sum of its proper divisors (5431865).

1131323131 is an frugal number, since it uses more digits than its factorization.

1131323131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25833 (or 25622 counting only the distinct ones).

The product of its digits is 162, while the sum is 19.

The square root of 1131323131 is about 33635.1472569989. The cubic root of 1131323131 is about 1041.9868118843.

Adding to 1131323131 its reverse (1313231311), we get a palindrome (2444554442).

The spelling of 1131323131 in words is "one billion, one hundred thirty-one million, three hundred twenty-three thousand, one hundred thirty-one".