1231043011 has 16 divisors (see below), whose sum is σ = 1390750560. Its totient is φ = 1079384320.

The previous prime is 1231042991. The next prime is 1231043027. The reversal of 1231043011 is 1103401321.

It is a cyclic number.

It is not a de Polignac number, because 1231043011 - 2⁵ = 1231042979 is a prime.

It is a super-2 number, since 2×1231043011² = 3030933789863892242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231043071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 455781 + ... + 458473.

It is an arithmetic number, because the mean of its divisors is an integer number (86921910).

Almost surely, 2^1231043011 is an apocalyptic number.

1231043011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1231043011 is a deficient number, since it is larger than the sum of its proper divisors (159707549).

1231043011 is a wasteful number, since it uses less digits than its factorization.

1231043011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1231043011 is about 35086.2225239481. Note that the first 3 decimals coincide. The cubic root of 1231043011 is about 1071.7440364389.

Adding to 1231043011 its reverse (1103401321), we get a palindrome (2334444332).

The spelling of 1231043011 in words is "one billion, two hundred thirty-one million, forty-three thousand, eleven".