2195519561 has 2 divisors, whose sum is σ = 2195519562. Its totient is φ = 2195519560.

The previous prime is 2195519549. The next prime is 2195519591. The reversal of 2195519561 is 1659155912.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1201315600 + 994203961 = 34660^2 + 31531^2 .

It is a cyclic number.

It is not a de Polignac number, because 2195519561 - 2⁶ = 2195519497 is a prime.

It is a super-2 number, since 2×2195519561² = 9640612285467265442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2195519591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097759780 + 1097759781.

It is an arithmetic number, because the mean of its divisors is an integer number (1097759781).

Almost surely, 2^2195519561 is an apocalyptic number.

It is an amenable number.

2195519561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2195519561 is an equidigital number, since it uses as much as digits as its factorization.

2195519561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 121500, while the sum is 44.

The square root of 2195519561 is about 46856.3716158219. The cubic root of 2195519561 is about 1299.7079345851.

The spelling of 2195519561 in words is "two billion, one hundred ninety-five million, five hundred nineteen thousand, five hundred sixty-one".