1323123131 has 16 divisors (see below), whose sum is σ = 1456697088. Its totient is φ = 1191813600.

The previous prime is 1323123103. The next prime is 1323123133. The reversal of 1323123131 is 1313213231.

It is a cyclic number.

It is not a de Polignac number, because 1323123131 - 2¹⁰ = 1323122107 is a prime.

It is a super-2 number, since 2×1323123131² = 3501309639574486322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1323123133) 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, 684236 + ... + 686166.

It is an arithmetic number, because the mean of its divisors is an integer number (91043568).

Almost surely, 2^1323123131 is an apocalyptic number.

1323123131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1323123131 is a deficient number, since it is larger than the sum of its proper divisors (133573957).

1323123131 is a wasteful number, since it uses less digits than its factorization.

1323123131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2482.

The product of its digits is 324, while the sum is 20.

The square root of 1323123131 is about 36374.7595318512. The cubic root of 1323123131 is about 1097.8257689399.

Adding to 1323123131 its reverse (1313213231), we get a palindrome (2636336362).

The spelling of 1323123131 in words is "one billion, three hundred twenty-three million, one hundred twenty-three thousand, one hundred thirty-one".