1636541 has 2 divisors, whose sum is σ = 1636542. Its totient is φ = 1636540.

The previous prime is 1636529. The next prime is 1636543. The reversal of 1636541 is 1456361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1110916 + 525625 = 1054^2 + 725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1636541 is a prime.

Together with 1636543, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 1636541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1636543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 818270 + 818271.

It is an arithmetic number, because the mean of its divisors is an integer number (818271).

2^1636541 is an apocalyptic number.

It is an amenable number.

1636541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1636541 is an equidigital number, since it uses as much as digits as its factorization.

1636541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

The square root of 1636541 is about 1279.2736220215. The cubic root of 1636541 is about 117.8444037479.

The spelling of 1636541 in words is "one million, six hundred thirty-six thousand, five hundred forty-one".