1321325605 has 16 divisors (see below), whose sum is σ = 1601512704. Its totient is φ = 1046485440.

The previous prime is 1321325587. The next prime is 1321325627. The reversal of 1321325605 is 5065231231.

It is not a de Polignac number, because 1321325605 - 2¹⁵ = 1321292837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 301087 + ... + 305443.

It is an arithmetic number, because the mean of its divisors is an integer number (100094544).

Almost surely, 2^1321325605 is an apocalyptic number.

It is an amenable number.

1321325605 is a deficient number, since it is larger than the sum of its proper divisors (280187099).

1321325605 is a wasteful number, since it uses less digits than its factorization.

1321325605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4956.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 1321325605 is about 36350.0427097411. The cubic root of 1321325605 is about 1097.3283940468.

Adding to 1321325605 its reverse (5065231231), we get a palindrome (6386556836).

The spelling of 1321325605 in words is "one billion, three hundred twenty-one million, three hundred twenty-five thousand, six hundred five".