2103001661 has 2 divisors, whose sum is σ = 2103001662. Its totient is φ = 2103001660.

The previous prime is 2103001651. The next prime is 2103001673. The reversal of 2103001661 is 1661003012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2070796036 + 32205625 = 45506^2 + 5675^2 .

It is a cyclic number.

It is not a de Polignac number, because 2103001661 - 2¹⁴ = 2102985277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2103001601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051500830 + 1051500831.

It is an arithmetic number, because the mean of its divisors is an integer number (1051500831).

Almost surely, 2^2103001661 is an apocalyptic number.

It is an amenable number.

2103001661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2103001661 is an equidigital number, since it uses as much as digits as its factorization.

2103001661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 2103001661 is about 45858.4960612535. The cubic root of 2103001661 is about 1281.1890117438.

Adding to 2103001661 its reverse (1661003012), we get a palindrome (3764004673).

The spelling of 2103001661 in words is "two billion, one hundred three million, one thousand, six hundred sixty-one".