1131211023 has 16 divisors (see below), whose sum is σ = 1535235072. Its totient is φ = 740700000.

The previous prime is 1131211007. The next prime is 1131211043. The reversal of 1131211023 is 3201121311.

It is a happy number.

It is not a de Polignac number, because 1131211023 - 2⁴ = 1131211007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1131210993 and 1131211011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131211043) 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, 133318 + ... + 141548.

It is an arithmetic number, because the mean of its divisors is an integer number (95952192).

Almost surely, 2^1131211023 is an apocalyptic number.

1131211023 is a deficient number, since it is larger than the sum of its proper divisors (404024049).

1131211023 is an equidigital number, since it uses as much as digits as its factorization.

1131211023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9046.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1131211023 is about 33633.4806851744. The cubic root of 1131211023 is about 1041.9523923293.

Adding to 1131211023 its reverse (3201121311), we get a palindrome (4332332334).

The spelling of 1131211023 in words is "one billion, one hundred thirty-one million, two hundred eleven thousand, twenty-three".