1995581 has 8 divisors (see below), whose sum is σ = 2304960. Its totient is φ = 1692288.

The previous prime is 1995547. The next prime is 1995583. The reversal of 1995581 is 1855991.

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

It is a cyclic number.

It is not a de Polignac number, because 1995581 - 2⁶ = 1995517 is a prime.

It is a super-2 number, since 2×1995581² = 7964687055122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1995583) 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, 791 + ... + 2148.

It is an arithmetic number, because the mean of its divisors is an integer number (288120).

2^1995581 is an apocalyptic number.

It is an amenable number.

1995581 is a deficient number, since it is larger than the sum of its proper divisors (309379).

1995581 is an equidigital number, since it uses as much as digits as its factorization.

1995581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3043.

The product of its digits is 16200, while the sum is 38.

The square root of 1995581 is about 1412.6503459809. The cubic root of 1995581 is about 125.8992433780.

The spelling of 1995581 in words is "one million, nine hundred ninety-five thousand, five hundred eighty-one".