1111312231 has 4 divisors (see below), whose sum is σ = 1111727592. Its totient is φ = 1110896872.

The previous prime is 1111312201. The next prime is 1111312247. The reversal of 1111312231 is 1322131111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1111312231 - 2¹¹ = 1111310183 is a prime.

It is a super-2 number, since 2×1111312231² = 2470029749540394722, 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 (1111312201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203641 + ... + 209026.

It is an arithmetic number, because the mean of its divisors is an integer number (277931898).

Almost surely, 2^1111312231 is an apocalyptic number.

1111312231 is a deficient number, since it is larger than the sum of its proper divisors (415361).

1111312231 is an equidigital number, since it uses as much as digits as its factorization.

1111312231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415360.

The product of its digits is 36, while the sum is 16.

The square root of 1111312231 is about 33336.3499951629. The cubic root of 1111312231 is about 1035.8066575067.

Adding to 1111312231 its reverse (1322131111), we get a palindrome (2433443342).

The spelling of 1111312231 in words is "one billion, one hundred eleven million, three hundred twelve thousand, two hundred thirty-one".