1231123213131 has 8 divisors (see below), whose sum is σ = 1875997277184. Its totient is φ = 703498978920.

The previous prime is 1231123213121. The next prime is 1231123213169. The reversal of 1231123213131 is 1313123211321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231123213131 - 2¹⁴ = 1231123196747 is a prime.

It is a super-2 number, since 2×1231123213131² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231123213121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29312457435 + ... + 29312457476.

It is an arithmetic number, because the mean of its divisors is an integer number (234499659648).

Almost surely, 2^{1231123213131} is an apocalyptic number.

1231123213131 is a deficient number, since it is larger than the sum of its proper divisors (644874064053).

1231123213131 is an equidigital number, since it uses as much as digits as its factorization.

1231123213131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58624914921.

The product of its digits is 648, while the sum is 24.

Adding to 1231123213131 its reverse (1313123211321), we get a palindrome (2544246424452).

The spelling of 1231123213131 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-three million, two hundred thirteen thousand, one hundred thirty-one".