1636961 has 2 divisors, whose sum is σ = 1636962. Its totient is φ = 1636960.

The previous prime is 1636951. The next prime is 1636969. The reversal of 1636961 is 1696361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1366561 + 270400 = 1169^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 1636961 - 2¹⁰ = 1635937 is a prime.

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

It is not a weakly prime, because it can be changed into another prime (1636969) by changing a digit.

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 as a sum of consecutive naturals, namely, 818480 + 818481.

It is an arithmetic number, because the mean of its divisors is an integer number (818481).

2^1636961 is an apocalyptic number.

It is an amenable number.

1636961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1636961 is an equidigital number, since it uses as much as digits as its factorization.

1636961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 32.

The square root of 1636961 is about 1279.4377671462. The cubic root of 1636961 is about 117.8544840364.

The spelling of 1636961 in words is "one million, six hundred thirty-six thousand, nine hundred sixty-one".