1320100123 has 4 divisors (see below), whose sum is σ = 1320643368. Its totient is φ = 1319556880.

The previous prime is 1320100057. The next prime is 1320100127. The reversal of 1320100123 is 3210010231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320100123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320100127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267961 + ... + 272842.

It is an arithmetic number, because the mean of its divisors is an integer number (330160842).

Almost surely, 2^1320100123 is an apocalyptic number.

1320100123 is a deficient number, since it is larger than the sum of its proper divisors (543245).

1320100123 is an equidigital number, since it uses as much as digits as its factorization.

1320100123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543244.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1320100123 is about 36333.1821204804. The cubic root of 1320100123 is about 1096.9890449008.

Adding to 1320100123 its reverse (3210010231), we get a palindrome (4530110354).

The spelling of 1320100123 in words is "one billion, three hundred twenty million, one hundred thousand, one hundred twenty-three".