1606881 has 4 divisors (see below), whose sum is σ = 2142512. Its totient is φ = 1071252.

The previous prime is 1606879. The next prime is 1606889. The reversal of 1606881 is 1886061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1886061 = 3 ⋅628687.

It is not a de Polignac number, because 1606881 - 2¹ = 1606879 is a prime.

It is a super-2 number, since 2×1606881² = 5164133096322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

1606881 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1606889) 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, 267811 + ... + 267816.

It is an arithmetic number, because the mean of its divisors is an integer number (535628).

2^1606881 is an apocalyptic number.

It is an amenable number.

1606881 is a deficient number, since it is larger than the sum of its proper divisors (535631).

1606881 is an equidigital number, since it uses as much as digits as its factorization.

1606881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535630.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1606881 is about 1267.6281000357. The cubic root of 1606881 is about 117.1281377925.

The spelling of 1606881 in words is "one million, six hundred six thousand, eight hundred eighty-one".