1324199981 has 4 divisors (see below), whose sum is σ = 1426061532. Its totient is φ = 1222338432.

The previous prime is 1324199971. The next prime is 1324199983. The reversal of 1324199981 is 1899914231.

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

It can be written as a sum of positive squares in 2 ways, for example, as 94575625 + 1229624356 = 9725^2 + 35066^2 .

It is a cyclic number.

It is not a de Polignac number, because 1324199981 - 2¹⁸ = 1323937837 is a prime.

It is a super-2 number, since 2×1324199981² = 3507011179360800722, 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 (1324199983) 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, 50930756 + ... + 50930781.

It is an arithmetic number, because the mean of its divisors is an integer number (356515383).

Almost surely, 2^1324199981 is an apocalyptic number.

It is an amenable number.

1324199981 is a deficient number, since it is larger than the sum of its proper divisors (101861551).

1324199981 is a wasteful number, since it uses less digits than its factorization.

1324199981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101861550.

The product of its digits is 139968, while the sum is 47.

The square root of 1324199981 is about 36389.5586810283. The cubic root of 1324199981 is about 1098.1235172697.

The spelling of 1324199981 in words is "one billion, three hundred twenty-four million, one hundred ninety-nine thousand, nine hundred eighty-one".