1609728197 has 16 divisors (see below), whose sum is σ = 2018967552. Its totient is φ = 1246812720.

The previous prime is 1609728193. The next prime is 1609728233. The reversal of 1609728197 is 7918279061.

It is a cyclic number.

It is not a de Polignac number, because 1609728197 - 2² = 1609728193 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1609728191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49733 + ... + 75450.

It is an arithmetic number, because the mean of its divisors is an integer number (126185472).

Almost surely, 2^1609728197 is an apocalyptic number.

It is an amenable number.

1609728197 is a deficient number, since it is larger than the sum of its proper divisors (409239355).

1609728197 is a wasteful number, since it uses less digits than its factorization.

1609728197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125368.

The product of its (nonzero) digits is 381024, while the sum is 50.

The square root of 1609728197 is about 40121.4181828110. The cubic root of 1609728197 is about 1171.9727589505.

The spelling of 1609728197 in words is "one billion, six hundred nine million, seven hundred twenty-eight thousand, one hundred ninety-seven".