1312100111 has 16 divisors (see below), whose sum is σ = 1509580800. Its totient is φ = 1117153728.

The previous prime is 1312100087. The next prime is 1312100117. The reversal of 1312100111 is 1110012131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1312100111 - 2⁶ = 1312100047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312100092 and 1312100101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312100117) 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, 1262330 + ... + 1263368.

It is an arithmetic number, because the mean of its divisors is an integer number (94348800).

Almost surely, 2^1312100111 is an apocalyptic number.

1312100111 is a deficient number, since it is larger than the sum of its proper divisors (197480689).

1312100111 is a wasteful number, since it uses less digits than its factorization.

1312100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 1312100111 is about 36222.9224525024. The cubic root of 1312100111 is about 1094.7685786595.

Adding to 1312100111 its reverse (1110012131), we get a palindrome (2422112242).

The spelling of 1312100111 in words is "one billion, three hundred twelve million, one hundred thousand, one hundred eleven".