1231222311 has 36 divisors (see below), whose sum is σ = 2000342344. Its totient is φ = 728814240.

The previous prime is 1231222283. The next prime is 1231222339. The reversal of 1231222311 is 1132221321.

It is an interprime number because it is at equal distance from previous prime (1231222283) and next prime (1231222339).

It is not a de Polignac number, because 1231222311 - 2⁶ = 1231222247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231222711) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 33681 + ... + 59973.

Almost surely, 2^1231222311 is an apocalyptic number.

1231222311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1231222311 is a deficient number, since it is larger than the sum of its proper divisors (769120033).

1231222311 is a wasteful number, since it uses less digits than its factorization.

1231222311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26364 (or 26350 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1231222311 is about 35088.7775649138. Note that the first 3 decimals coincide. The cubic root of 1231222311 is about 1071.7960666754.

Adding to 1231222311 its reverse (1132221321), we get a palindrome (2363443632).

The spelling of 1231222311 in words is "one billion, two hundred thirty-one million, two hundred twenty-two thousand, three hundred eleven".