1609278361 has 8 divisors (see below), whose sum is σ = 1705812480. Its totient is φ = 1512952128.

The previous prime is 1609278347. The next prime is 1609278371. The reversal of 1609278361 is 1638729061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1609278361 - 2¹⁷ = 1609147289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1609278301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35881 + ... + 67126.

It is an arithmetic number, because the mean of its divisors is an integer number (213226560).

Almost surely, 2^1609278361 is an apocalyptic number.

It is an amenable number.

1609278361 is a deficient number, since it is larger than the sum of its proper divisors (96534119).

1609278361 is a wasteful number, since it uses less digits than its factorization.

1609278361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103943.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 1609278361 is about 40115.8118576703. The cubic root of 1609278361 is about 1171.8635801350.

The spelling of 1609278361 in words is "one billion, six hundred nine million, two hundred seventy-eight thousand, three hundred sixty-one".