1311200123 has 16 divisors (see below), whose sum is σ = 1450509120. Its totient is φ = 1178935296.

The previous prime is 1311200081. The next prime is 1311200141. The reversal of 1311200123 is 3210021131.

It is a cyclic number.

It is not a de Polignac number, because 1311200123 - 2⁸ = 1311199867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311200098 and 1311200107.

It is not an unprimeable number, because it can be changed into a prime (1311200153) 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, 416411 + ... + 419547.

It is an arithmetic number, because the mean of its divisors is an integer number (90656820).

Almost surely, 2^1311200123 is an apocalyptic number.

1311200123 is a deficient number, since it is larger than the sum of its proper divisors (139308997).

1311200123 is a wasteful number, since it uses less digits than its factorization.

1311200123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4246.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1311200123 is about 36210.4974144239. The cubic root of 1311200123 is about 1094.5182156642.

Adding to 1311200123 its reverse (3210021131), we get a palindrome (4521221254).

The spelling of 1311200123 in words is "one billion, three hundred eleven million, two hundred thousand, one hundred twenty-three".