1326631213 has 4 divisors (see below), whose sum is σ = 1326932928. Its totient is φ = 1326329500.

The previous prime is 1326631211. The next prime is 1326631231. The reversal of 1326631213 is 3121366231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1326631213 - 2¹ = 1326631211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1326631211) 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, 144163 + ... + 153088.

It is an arithmetic number, because the mean of its divisors is an integer number (331733232).

Almost surely, 2^1326631213 is an apocalyptic number.

It is an amenable number.

1326631213 is a deficient number, since it is larger than the sum of its proper divisors (301715).

1326631213 is an equidigital number, since it uses as much as digits as its factorization.

1326631213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301714.

The product of its digits is 3888, while the sum is 28.

The square root of 1326631213 is about 36422.9489882409. The cubic root of 1326631213 is about 1098.7951582162.

Adding to 1326631213 its reverse (3121366231), we get a palindrome (4447997444).

The spelling of 1326631213 in words is "one billion, three hundred twenty-six million, six hundred thirty-one thousand, two hundred thirteen".