2195000261 has 2 divisors, whose sum is σ = 2195000262. Its totient is φ = 2195000260.

The previous prime is 2195000257. The next prime is 2195000263. The reversal of 2195000261 is 1620005912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1467349636 + 727650625 = 38306^2 + 26975^2 .

It is a cyclic number.

It is not a de Polignac number, because 2195000261 - 2² = 2195000257 is a prime.

It is a super-2 number, since 2×2195000261² = 9636052291580136242, which contains 22 as substring.

Together with 2195000263, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2195000261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2195000263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097500130 + 1097500131.

It is an arithmetic number, because the mean of its divisors is an integer number (1097500131).

Almost surely, 2^2195000261 is an apocalyptic number.

It is an amenable number.

2195000261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2195000261 is an equidigital number, since it uses as much as digits as its factorization.

2195000261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 2195000261 is about 46850.8298859262. The cubic root of 2195000261 is about 1299.6054544306.

The spelling of 2195000261 in words is "two billion, one hundred ninety-five million, two hundred sixty-one", and thus it is an aban number.