1312120123 has 8 divisors (see below), whose sum is σ = 1370337696. Its totient is φ = 1254000000.

The previous prime is 1312120097. The next prime is 1312120127. The reversal of 1312120123 is 3210212131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312120123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312120097 and 1312120106.

It is not an unprimeable number, because it can be changed into a prime (1312120127) 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, 3873 + ... + 51373.

It is an arithmetic number, because the mean of its divisors is an integer number (171292212).

Almost surely, 2^1312120123 is an apocalyptic number.

1312120123 is a deficient number, since it is larger than the sum of its proper divisors (58217573).

1312120123 is a wasteful number, since it uses less digits than its factorization.

1312120123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48725.

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

The square root of 1312120123 is about 36223.1986853729. The cubic root of 1312120123 is about 1094.7741443926.

Adding to 1312120123 its reverse (3210212131), we get a palindrome (4522332254).

The spelling of 1312120123 in words is "one billion, three hundred twelve million, one hundred twenty thousand, one hundred twenty-three".