1231011123 has 16 divisors (see below), whose sum is σ = 1738832256. Its totient is φ = 771984000.

The previous prime is 1231011113. The next prime is 1231011143. The reversal of 1231011123 is 3211101321.

It is a happy number.

It is not a de Polignac number, because 1231011123 - 2⁴ = 1231011107 is a prime.

It is a super-2 number, since 2×1231011123² = 3030776769899442258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231011113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109440 + ... + 120162.

It is an arithmetic number, because the mean of its divisors is an integer number (108677016).

Almost surely, 2^1231011123 is an apocalyptic number.

1231011123 is a deficient number, since it is larger than the sum of its proper divisors (507821133).

1231011123 is a wasteful number, since it uses less digits than its factorization.

1231011123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12994.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1231011123 is about 35085.7680976204. The cubic root of 1231011123 is about 1071.7347824787.

Adding to 1231011123 its reverse (3211101321), we get a palindrome (4442112444).

The spelling of 1231011123 in words is "one billion, two hundred thirty-one million, eleven thousand, one hundred twenty-three".