1231122013 has 4 divisors (see below), whose sum is σ = 1343042208. Its totient is φ = 1119201820.

The previous prime is 1231121981. The next prime is 1231122019. The reversal of 1231122013 is 3102211321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3102211321 = 11 ⋅282019211.

It is not a de Polignac number, because 1231122013 - 2⁵ = 1231121981 is a prime.

It is a super-2 number, since 2×1231122013² = 3031322821786344338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231122019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55960081 + ... + 55960102.

It is an arithmetic number, because the mean of its divisors is an integer number (335760552).

Almost surely, 2^1231122013 is an apocalyptic number.

It is an amenable number.

1231122013 is a deficient number, since it is larger than the sum of its proper divisors (111920195).

1231122013 is a wasteful number, since it uses less digits than its factorization.

1231122013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111920194.

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

The square root of 1231122013 is about 35087.3483324118. The cubic root of 1231122013 is about 1071.7669622859.

Adding to 1231122013 its reverse (3102211321), we get a palindrome (4333333334).

The spelling of 1231122013 in words is "one billion, two hundred thirty-one million, one hundred twenty-two thousand, thirteen".