1328617081 has 4 divisors (see below), whose sum is σ = 1449400464. Its totient is φ = 1207833700.

The previous prime is 1328617063. The next prime is 1328617109. The reversal of 1328617081 is 1807168231.

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 1328617081 - 2²³ = 1320228473 is a prime.

It is a super-2 number, since 2×1328617081² = 3530446695849921122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1328617081.

It is not an unprimeable number, because it can be changed into a prime (1328617001) 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, 60391675 + ... + 60391696.

It is an arithmetic number, because the mean of its divisors is an integer number (362350116).

Almost surely, 2^1328617081 is an apocalyptic number.

1328617081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1328617081 is a deficient number, since it is larger than the sum of its proper divisors (120783383).

1328617081 is a wasteful number, since it uses less digits than its factorization.

1328617081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120783382.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 1328617081 is about 36450.2000131687. The cubic root of 1328617081 is about 1099.3431563415.

The spelling of 1328617081 in words is "one billion, three hundred twenty-eight million, six hundred seventeen thousand, eighty-one".