2195717081 has 4 divisors (see below), whose sum is σ = 2195930532. Its totient is φ = 2195503632.

The previous prime is 2195717077. The next prime is 2195717087. The reversal of 2195717081 is 1807175912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 794337856 + 1401379225 = 28184^2 + 37435^2 .

It is a cyclic number.

It is not a de Polignac number, because 2195717081 - 2² = 2195717077 is a prime.

It is a super-2 number, since 2×2195717081² = 9642346999590321122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2195717087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90470 + ... + 112143.

It is an arithmetic number, because the mean of its divisors is an integer number (548982633).

Almost surely, 2^2195717081 is an apocalyptic number.

It is an amenable number.

2195717081 is a deficient number, since it is larger than the sum of its proper divisors (213451).

2195717081 is a wasteful number, since it uses less digits than its factorization.

2195717081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213450.

The product of its (nonzero) digits is 35280, while the sum is 41.

The square root of 2195717081 is about 46858.4792860374. The cubic root of 2195717081 is about 1299.7469095074.

The spelling of 2195717081 in words is "two billion, one hundred ninety-five million, seven hundred seventeen thousand, eighty-one".