1131323031 has 20 divisors (see below), whose sum is σ = 1748280600. Its totient is φ = 728206416.

The previous prime is 1131323029. The next prime is 1131323033. The reversal of 1131323031 is 1303231311.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1131323029) and next prime (1131323033).

It is not a de Polignac number, because 1131323031 - 2¹ = 1131323029 is a prime.

It is a super-2 number, since 2×1131323031² = 2559783600942053922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1131322995 and 1131323013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131323033) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 238461 + ... + 243158.

It is an arithmetic number, because the mean of its divisors is an integer number (87414030).

Almost surely, 2^1131323031 is an apocalyptic number.

1131323031 is a deficient number, since it is larger than the sum of its proper divisors (616957569).

1131323031 is an equidigital number, since it uses as much as digits as its factorization.

1131323031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481660 (or 481651 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 1131323031 is about 33635.1457704586. The cubic root of 1131323031 is about 1041.9867811832.

Adding to 1131323031 its reverse (1303231311), we get a palindrome (2434554342).

The spelling of 1131323031 in words is "one billion, one hundred thirty-one million, three hundred twenty-three thousand, thirty-one".