2195521 has 2 divisors, whose sum is σ = 2195522. Its totient is φ = 2195520.

The previous prime is 2195471. The next prime is 2195527. The reversal of 2195521 is 1255912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1690000 + 505521 = 1300^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 2195521 - 2⁹ = 2195009 is a prime.

It is a super-2 number, since 2×2195521² = 9640624922882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2195527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097760 + 1097761.

It is an arithmetic number, because the mean of its divisors is an integer number (1097761).

2^2195521 is an apocalyptic number.

It is an amenable number.

2195521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2195521 is an equidigital number, since it uses as much as digits as its factorization.

2195521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 25.

The square root of 2195521 is about 1481.7290575540. The cubic root of 2195521 is about 129.9708218539.

The spelling of 2195521 in words is "two million, one hundred ninety-five thousand, five hundred twenty-one".