1995631 has 4 divisors (see below), whose sum is σ = 2177064. Its totient is φ = 1814200.

The previous prime is 1995629. The next prime is 1995649. The reversal of 1995631 is 1365991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1365991 = 11 ⋅124181.

It is a cyclic number.

It is not a de Polignac number, because 1995631 - 2¹ = 1995629 is a prime.

It is a super-2 number, since 2×1995631² = 7965086176322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1995611) 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, 90700 + ... + 90721.

It is an arithmetic number, because the mean of its divisors is an integer number (544266).

2^1995631 is an apocalyptic number.

1995631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1995631 is a deficient number, since it is larger than the sum of its proper divisors (181433).

1995631 is a wasteful number, since it uses less digits than its factorization.

1995631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181432.

The product of its digits is 7290, while the sum is 34.

The square root of 1995631 is about 1412.6680431014. The cubic root of 1995631 is about 125.9002948528.

The spelling of 1995631 in words is "one million, nine hundred ninety-five thousand, six hundred thirty-one".