1311000120123 has 16 divisors (see below), whose sum is σ = 1796185094400. Its totient is φ = 849932394336.

The previous prime is 1311000120103. The next prime is 1311000120173. The reversal of 1311000120123 is 3210210001131.

It is a happy number.

It is not a de Polignac number, because 1311000120123 - 2¹⁷ = 1310999989051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311000120103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2885023 + ... + 3308376.

It is an arithmetic number, because the mean of its divisors is an integer number (112261568400).

Almost surely, 2^{1311000120123} is an apocalyptic number.

1311000120123 is a deficient number, since it is larger than the sum of its proper divisors (485184974277).

1311000120123 is a wasteful number, since it uses less digits than its factorization.

1311000120123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6195346.

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

Adding to 1311000120123 its reverse (3210210001131), we get a palindrome (4521210121254).

The spelling of 1311000120123 in words is "one trillion, three hundred eleven billion, one hundred twenty thousand, one hundred twenty-three".