1601995 has 16 divisors (see below), whose sum is σ = 2083968. Its totient is φ = 1177600.

The previous prime is 1601969. The next prime is 1602011. The reversal of 1601995 is 5991061.

It is not a de Polignac number, because 1601995 - 2⁷ = 1601867 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3795 + ... + 4195.

It is an arithmetic number, because the mean of its divisors is an integer number (130248).

2^1601995 is an apocalyptic number.

1601995 is a deficient number, since it is larger than the sum of its proper divisors (481973).

1601995 is a wasteful number, since it uses less digits than its factorization.

1601995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 1601995 is about 1265.6994113928. The cubic root of 1601995 is about 117.0093011331.

The spelling of 1601995 in words is "one million, six hundred one thousand, nine hundred ninety-five".