1231312231 has 8 divisors (see below), whose sum is σ = 1234920960. Its totient is φ = 1227710232.

The previous prime is 1231312217. The next prime is 1231312259. The reversal of 1231312231 is 1322131321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231312231 - 2²³ = 1222923623 is a prime.

It is a super-2 number, since 2×1231312231² = 3032259620420394722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231312199 and 1231312208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231312211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 789030 + ... + 790588.

It is an arithmetic number, because the mean of its divisors is an integer number (154365120).

Almost surely, 2^1231312231 is an apocalyptic number.

1231312231 is a deficient number, since it is larger than the sum of its proper divisors (3608729).

1231312231 is a wasteful number, since it uses less digits than its factorization.

1231312231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3365.

The product of its digits is 216, while the sum is 19.

The square root of 1231312231 is about 35090.0588628745. The cubic root of 1231312231 is about 1071.8221582418.

Adding to 1231312231 its reverse (1322131321), we get a palindrome (2553443552).

The spelling of 1231312231 in words is "one billion, two hundred thirty-one million, three hundred twelve thousand, two hundred thirty-one".