1131523011 has 12 divisors (see below), whose sum is σ = 1678596192. Its totient is φ = 733960656.

The previous prime is 1131523007. The next prime is 1131523031. The reversal of 1131523011 is 1103251311.

1131523011 is a `hidden beast` number, since 1 + 131 + 523 + 0 + 11 = 666.

It is not a de Polignac number, because 1131523011 - 2² = 1131523007 is a prime.

It is a super-2 number, since 2×1131523011² = 2560688648845012242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1131523031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1698651 + ... + 1699316.

It is an arithmetic number, because the mean of its divisors is an integer number (139883016).

Almost surely, 2^1131523011 is an apocalyptic number.

1131523011 is a deficient number, since it is larger than the sum of its proper divisors (547073181).

1131523011 is a wasteful number, since it uses less digits than its factorization.

1131523011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3398010 (or 3398007 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 1131523011 is about 33638.1184224088. The cubic root of 1131523011 is about 1042.0481736809.

Adding to 1131523011 its reverse (1103251311), we get a palindrome (2234774322).

The spelling of 1131523011 in words is "one billion, one hundred thirty-one million, five hundred twenty-three thousand, eleven".