1213113231 has 12 divisors (see below), whose sum is σ = 1911572520. Its totient is φ = 735220080.

The previous prime is 1213113229. The next prime is 1213113233. The reversal of 1213113231 is 1323113121.

1213113231 is a `hidden beast` number, since 121 + 311 + 3 + 231 = 666.

It is an interprime number because it is at equal distance from previous prime (1213113229) and next prime (1213113233).

It is not a de Polignac number, because 1213113231 - 2¹ = 1213113229 is a prime.

It is a super-2 number, since 2×1213113231² = 2943287422454518722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213113233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6126736 + ... + 6126933.

It is an arithmetic number, because the mean of its divisors is an integer number (159297710).

Almost surely, 2^1213113231 is an apocalyptic number.

1213113231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1213113231 is a deficient number, since it is larger than the sum of its proper divisors (698459289).

1213113231 is a wasteful number, since it uses less digits than its factorization.

1213113231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12253686 (or 12253683 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1213113231 is about 34829.7750638732. The cubic root of 1213113231 is about 1066.5153565428.

Adding to 1213113231 its reverse (1323113121), we get a palindrome (2536226352).

The spelling of 1213113231 in words is "one billion, two hundred thirteen million, one hundred thirteen thousand, two hundred thirty-one".