1331023123 has 4 divisors (see below), whose sum is σ = 1331650440. Its totient is φ = 1330395808.

The previous prime is 1331023117. The next prime is 1331023151. The reversal of 1331023123 is 3213201331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3213201331 = 17 ⋅189011843.

It is a cyclic number.

It is not a de Polignac number, because 1331023123 - 2¹³ = 1331014931 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331023123.

It is not an unprimeable number, because it can be changed into a prime (1331023103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310465 + ... + 314722.

It is an arithmetic number, because the mean of its divisors is an integer number (332912610).

Almost surely, 2^1331023123 is an apocalyptic number.

1331023123 is a deficient number, since it is larger than the sum of its proper divisors (627317).

1331023123 is an equidigital number, since it uses as much as digits as its factorization.

1331023123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627316.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 1331023123 is about 36483.1895946613. The cubic root of 1331023123 is about 1100.0063699356.

Adding to 1331023123 its reverse (3213201331), we get a palindrome (4544224454).

The spelling of 1331023123 in words is "one billion, three hundred thirty-one million, twenty-three thousand, one hundred twenty-three".