1328173541 has 4 divisors (see below), whose sum is σ = 1328289900. Its totient is φ = 1328057184.

The previous prime is 1328173531. The next prime is 1328173543. The reversal of 1328173541 is 1453718231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 472845025 + 855328516 = 21745^2 + 29246^2 .

It is a cyclic number.

It is not a de Polignac number, because 1328173541 - 2⁶ = 1328173477 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 (1328173543) 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, 38936 + ... + 64593.

It is an arithmetic number, because the mean of its divisors is an integer number (332072475).

Almost surely, 2^1328173541 is an apocalyptic number.

It is an amenable number.

1328173541 is a deficient number, since it is larger than the sum of its proper divisors (116359).

1328173541 is a wasteful number, since it uses less digits than its factorization.

1328173541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116358.

The product of its digits is 20160, while the sum is 35.

The square root of 1328173541 is about 36444.1153137238. The cubic root of 1328173541 is about 1099.2208093436.

The spelling of 1328173541 in words is "one billion, three hundred twenty-eight million, one hundred seventy-three thousand, five hundred forty-one".