1131001231 has 16 divisors (see below), whose sum is σ = 1158585120. Its totient is φ = 1103872000.

The previous prime is 1131001229. The next prime is 1131001271. The reversal of 1131001231 is 1321001311.

It is a cyclic number.

It is not a de Polignac number, because 1131001231 - 2¹ = 1131001229 is a prime.

It is a super-2 number, since 2×1131001231² = 2558327569047030722, 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 (1131001271) 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 15 ways as a sum of consecutive naturals, for example, 4400655 + ... + 4400911.

It is an arithmetic number, because the mean of its divisors is an integer number (72411570).

Almost surely, 2^1131001231 is an apocalyptic number.

1131001231 is a deficient number, since it is larger than the sum of its proper divisors (27583889).

1131001231 is a wasteful number, since it uses less digits than its factorization.

1131001231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1131001231 is about 33630.3617435198. The cubic root of 1131001231 is about 1041.8879755858.

Adding to 1131001231 its reverse (1321001311), we get a palindrome (2452002542).

The spelling of 1131001231 in words is "one billion, one hundred thirty-one million, one thousand, two hundred thirty-one".