1131023311 has 16 divisors (see below), whose sum is σ = 1314011808. Its totient is φ = 962099200.

The previous prime is 1131023269. The next prime is 1131023323. The reversal of 1131023311 is 1133201311.

It is a cyclic number.

It is not a de Polignac number, because 1131023311 - 2¹¹ = 1131021263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131023381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14871 + ... + 49831.

It is an arithmetic number, because the mean of its divisors is an integer number (82125738).

Almost surely, 2^1131023311 is an apocalyptic number.

1131023311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1131023311 is a deficient number, since it is larger than the sum of its proper divisors (182988497).

1131023311 is a wasteful number, since it uses less digits than its factorization.

1131023311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35162.

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

The square root of 1131023311 is about 33630.6900167094. The cubic root of 1131023311 is about 1041.8947556364.

Adding to 1131023311 its reverse (1133201311), we get a palindrome (2264224622).

The spelling of 1131023311 in words is "one billion, one hundred thirty-one million, twenty-three thousand, three hundred eleven".