1916161 has 4 divisors (see below), whose sum is σ = 2063572. Its totient is φ = 1768752.

The previous prime is 1916147. The next prime is 1916179. The reversal of 1916161 is 1616191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1616191 = 179 ⋅9029.

It can be written as a sum of positive squares in 2 ways, for example, as 801025 + 1115136 = 895^2 + 1056^2 .

It is a cyclic number.

It is not a de Polignac number, because 1916161 - 2⁵ = 1916129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1913161) 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, 73686 + ... + 73711.

It is an arithmetic number, because the mean of its divisors is an integer number (515893).

2^1916161 is an apocalyptic number.

It is an amenable number.

1916161 is a deficient number, since it is larger than the sum of its proper divisors (147411).

1916161 is a wasteful number, since it uses less digits than its factorization.

1916161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147410.

The product of its digits is 324, while the sum is 25.

The square root of 1916161 is about 1384.2546731003. The cubic root of 1916161 is about 124.2064070103.

The spelling of 1916161 in words is "one million, nine hundred sixteen thousand, one hundred sixty-one".