1131101231 has 4 divisors (see below), whose sum is σ = 1218109032. Its totient is φ = 1044093432.

The previous prime is 1131101227. The next prime is 1131101263. The reversal of 1131101231 is 1321011311.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1321011311 = 3331 ⋅396581.

It is a cyclic number.

It is not a de Polignac number, because 1131101231 - 2² = 1131101227 is a prime.

It is a super-2 number, since 2×1131101231² = 2558779989539430722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131101431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43503881 + ... + 43503906.

It is an arithmetic number, because the mean of its divisors is an integer number (304527258).

Almost surely, 2^1131101231 is an apocalyptic number.

1131101231 is a deficient number, since it is larger than the sum of its proper divisors (87007801).

1131101231 is an equidigital number, since it uses as much as digits as its factorization.

1131101231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87007800.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1131101231 is about 33631.8484624322. The cubic root of 1131101231 is about 1041.9186816316.

Adding to 1131101231 its reverse (1321011311), we get a palindrome (2452112542).

The spelling of 1131101231 in words is "one billion, one hundred thirty-one million, one hundred one thousand, two hundred thirty-one".