1609328971 has 4 divisors (see below), whose sum is σ = 1619579632. Its totient is φ = 1599078312.

The previous prime is 1609328957. The next prime is 1609328977. The reversal of 1609328971 is 1798239061.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1609328971 - 2¹⁵ = 1609296203 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1609328977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5125095 + ... + 5125408.

It is an arithmetic number, because the mean of its divisors is an integer number (404894908).

Almost surely, 2^1609328971 is an apocalyptic number.

1609328971 is a deficient number, since it is larger than the sum of its proper divisors (10250661).

1609328971 is a wasteful number, since it uses less digits than its factorization.

1609328971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10250660.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 1609328971 is about 40116.4426513618. The cubic root of 1609328971 is about 1171.8758646048.

The spelling of 1609328971 in words is "one billion, six hundred nine million, three hundred twenty-eight thousand, nine hundred seventy-one".