1231004011 has 4 divisors (see below), whose sum is σ = 1243694872. Its totient is φ = 1218313152.

The previous prime is 1231004003. The next prime is 1231004069. The reversal of 1231004011 is 1104001321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1104001321 = 131 ⋅8427491.

It is a cyclic number.

It is not a de Polignac number, because 1231004011 - 2³ = 1231004003 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231003982 and 1231004000.

It is not an unprimeable number, because it can be changed into a prime (1231004081) 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 3 ways as a sum of consecutive naturals, for example, 6345285 + ... + 6345478.

It is an arithmetic number, because the mean of its divisors is an integer number (310923718).

Almost surely, 2^1231004011 is an apocalyptic number.

1231004011 is a deficient number, since it is larger than the sum of its proper divisors (12690861).

1231004011 is an equidigital number, since it uses as much as digits as its factorization.

1231004011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12690860.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1231004011 is about 35085.6667458380. Note that the first 3 decimals coincide. The cubic root of 1231004011 is about 1071.7327185406.

Adding to 1231004011 its reverse (1104001321), we get a palindrome (2335005332).

The spelling of 1231004011 in words is "one billion, two hundred thirty-one million, four thousand, eleven".