1321605069 has 8 divisors (see below), whose sum is σ = 1764628320. Its totient is φ = 879825936.

The previous prime is 1321605049. The next prime is 1321605091. The reversal of 1321605069 is 9605061231.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1321605069 - 2²⁰ = 1320556493 is a prime.

It is a super-2 number, since 2×1321605069² = 3493279916812989522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321605049) 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 7 ways as a sum of consecutive naturals, for example, 308547 + ... + 312800.

It is an arithmetic number, because the mean of its divisors is an integer number (220578540).

Almost surely, 2^1321605069 is an apocalyptic number.

It is an amenable number.

1321605069 is a deficient number, since it is larger than the sum of its proper divisors (443023251).

1321605069 is an equidigital number, since it uses as much as digits as its factorization.

1321605069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622059.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 1321605069 is about 36353.8865735151. The cubic root of 1321605069 is about 1097.4057512512.

The spelling of 1321605069 in words is "one billion, three hundred twenty-one million, six hundred five thousand, sixty-nine".