1323100391 has 4 divisors (see below), whose sum is σ = 1323186384. Its totient is φ = 1323014400.

The previous prime is 1323100313. The next prime is 1323100403. The reversal of 1323100391 is 1930013231.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1323100391 - 2¹⁸ = 1322838247 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 (1323100991) 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, 12890 + ... + 53031.

It is an arithmetic number, because the mean of its divisors is an integer number (330796596).

Almost surely, 2^1323100391 is an apocalyptic number.

1323100391 is a deficient number, since it is larger than the sum of its proper divisors (85993).

1323100391 is an equidigital number, since it uses as much as digits as its factorization.

1323100391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85992.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 1323100391 is about 36374.4469511222. The cubic root of 1323100391 is about 1097.8194796031.

The spelling of 1323100391 in words is "one billion, three hundred twenty-three million, one hundred thousand, three hundred ninety-one".