1323994661 has 4 divisors (see below), whose sum is σ = 1444357824. Its totient is φ = 1203631500.

The previous prime is 1323994631. The next prime is 1323994667. The reversal of 1323994661 is 1664993231.

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 1323994661 - 2²² = 1319800357 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 (1323994667) 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, 60181565 + ... + 60181586.

It is an arithmetic number, because the mean of its divisors is an integer number (361089456).

Almost surely, 2^1323994661 is an apocalyptic number.

1323994661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1323994661 is a deficient number, since it is larger than the sum of its proper divisors (120363163).

1323994661 is a wasteful number, since it uses less digits than its factorization.

1323994661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120363162.

The product of its digits is 209952, while the sum is 44.

The square root of 1323994661 is about 36386.7374327515. The cubic root of 1323994661 is about 1098.0667588802.

The spelling of 1323994661 in words is "one billion, three hundred twenty-three million, nine hundred ninety-four thousand, six hundred sixty-one".