1323457981 has 4 divisors (see below), whose sum is σ = 1323715932. Its totient is φ = 1323200032.

The previous prime is 1323457943. The next prime is 1323457987. The reversal of 1323457981 is 1897543231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1897543231 = 71 ⋅26725961.

It can be written as a sum of positive squares in 2 ways, for example, as 966588100 + 356869881 = 31090^2 + 18891^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323457981 - 2²¹ = 1321360829 is a prime.

It is a super-2 number, since 2×1323457981² = 3503082054945192722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323457987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121120 + ... + 131593.

It is an arithmetic number, because the mean of its divisors is an integer number (330928983).

Almost surely, 2^1323457981 is an apocalyptic number.

It is an amenable number.

1323457981 is a deficient number, since it is larger than the sum of its proper divisors (257951).

1323457981 is an equidigital number, since it uses as much as digits as its factorization.

1323457981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257950.

The product of its digits is 181440, while the sum is 43.

The square root of 1323457981 is about 36379.3620202444. The cubic root of 1323457981 is about 1097.9183720504.

The spelling of 1323457981 in words is "one billion, three hundred twenty-three million, four hundred fifty-seven thousand, nine hundred eighty-one".