1231022231 has 2 divisors, whose sum is σ = 1231022232. Its totient is φ = 1231022230.

The previous prime is 1231022203. The next prime is 1231022263. The reversal of 1231022231 is 1322201321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231022231 is a prime.

It is a super-2 number, since 2×1231022231² = 3030831466432434722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231025231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615511115 + 615511116.

It is an arithmetic number, because the mean of its divisors is an integer number (615511116).

Almost surely, 2^1231022231 is an apocalyptic number.

1231022231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231022231 is an equidigital number, since it uses as much as digits as its factorization.

1231022231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1231022231 is about 35085.9263950662. The cubic root of 1231022231 is about 1071.7380060603.

Adding to 1231022231 its reverse (1322201321), we get a palindrome (2553223552).

The spelling of 1231022231 in words is "one billion, two hundred thirty-one million, twenty-two thousand, two hundred thirty-one".