1995649 has 2 divisors, whose sum is σ = 1995650. Its totient is φ = 1995648.

The previous prime is 1995629. The next prime is 1995661. The reversal of 1995649 is 9465991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1809025 + 186624 = 1345^2 + 432^2 .

It is a cyclic number.

It is not a de Polignac number, because 1995649 - 2¹¹ = 1993601 is a prime.

It is a super-3 number, since 3×1995649³ = 23843704514509033347, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1995629) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997824 + 997825.

It is an arithmetic number, because the mean of its divisors is an integer number (997825).

2^1995649 is an apocalyptic number.

It is an amenable number.

1995649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1995649 is an equidigital number, since it uses as much as digits as its factorization.

1995649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 43.

The square root of 1995649 is about 1412.6744140105. The cubic root of 1995649 is about 125.9006733794.

The spelling of 1995649 in words is "one million, nine hundred ninety-five thousand, six hundred forty-nine".