1312123111 has 8 divisors (see below), whose sum is σ = 1443121344. Its totient is φ = 1185420000.

The previous prime is 1312123093. The next prime is 1312123139. The reversal of 1312123111 is 1113212131.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1312123111 - 2⁵ = 1312123079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312123151) 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 7 ways as a sum of consecutive naturals, for example, 1073140 + ... + 1074361.

It is an arithmetic number, because the mean of its divisors is an integer number (180390168).

Almost surely, 2^1312123111 is an apocalyptic number.

1312123111 is a deficient number, since it is larger than the sum of its proper divisors (130998233).

1312123111 is a wasteful number, since it uses less digits than its factorization.

1312123111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2147561.

The product of its digits is 36, while the sum is 16.

The square root of 1312123111 is about 36223.2399296363. The cubic root of 1312123111 is about 1094.7749754097.

Adding to 1312123111 its reverse (1113212131), we get a palindrome (2425335242).

The spelling of 1312123111 in words is "one billion, three hundred twelve million, one hundred twenty-three thousand, one hundred eleven".