2101651 has 2 divisors, whose sum is σ = 2101652. Its totient is φ = 2101650.

The previous prime is 2101621. The next prime is 2101657. The reversal of 2101651 is 1561012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2101651 - 2⁹ = 2101139 is a prime.

It is not a weakly prime, because it can be changed into another prime (2101657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050825 + 1050826.

It is an arithmetic number, because the mean of its divisors is an integer number (1050826).

2^2101651 is an apocalyptic number.

2101651 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101651 is an equidigital number, since it uses as much as digits as its factorization.

2101651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 2101651 is about 1449.7072118190. The cubic root of 2101651 is about 128.0914670127.

Adding to 2101651 its reverse (1561012), we get a palindrome (3662663).

It can be divided in two parts, 2 and 101651, that multiplied together give a palindrome (203302).

The spelling of 2101651 in words is "two million, one hundred one thousand, six hundred fifty-one".