1609161 has 8 divisors (see below), whose sum is σ = 2155104. Its totient is φ = 1068000.

The previous prime is 1609147. The next prime is 1609163. The reversal of 1609161 is 1619061.

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

It is not a de Polignac number, because 1609161 - 2¹¹ = 1607113 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1609163) 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, 316 + ... + 1821.

It is an arithmetic number, because the mean of its divisors is an integer number (269388).

2^1609161 is an apocalyptic number.

It is an amenable number.

1609161 is a deficient number, since it is larger than the sum of its proper divisors (545943).

1609161 is a wasteful number, since it uses less digits than its factorization.

1609161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2391.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1609161 is about 1268.5270986463. The cubic root of 1609161 is about 117.1835092330.

It can be divided in two parts, 1609 and 161, that added together give a triangular number (1770 = T₅₉).

The spelling of 1609161 in words is "one million, six hundred nine thousand, one hundred sixty-one".