1231000011 has 40 divisors (see below), whose sum is σ = 1869089904. Its totient is φ = 807312960.

The previous prime is 1231000009. The next prime is 1231000037. The reversal of 1231000011 is 1100001321.

It is not a de Polignac number, because 1231000011 - 2¹ = 1231000009 is a prime.

It is a super-2 number, since 2×1231000011² = 3030722054164000242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1230999957 and 1231000002.

It is not an unprimeable number, because it can be changed into a prime (1231000051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1498981 + ... + 1499801.

Almost surely, 2^1231000011 is an apocalyptic number.

1231000011 is a deficient number, since it is larger than the sum of its proper divisors (638089893).

1231000011 is a wasteful number, since it uses less digits than its factorization.

1231000011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113 (or 1104 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1231000011 is about 35085.6097424571. The cubic root of 1231000011 is about 1071.7315577170.

Adding to 1231000011 its reverse (1100001321), we get a palindrome (2331001332).

The spelling of 1231000011 in words is "one billion, two hundred thirty-one million, eleven", and thus it is an aban number.