2195731 has 2 divisors, whose sum is σ = 2195732. Its totient is φ = 2195730.

The previous prime is 2195729. The next prime is 2195749. The reversal of 2195731 is 1375912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2195731 - 2¹ = 2195729 is a prime.

It is a super-2 number, since 2×2195731² = 9642469248722, which contains 22 as substring.

Together with 2195729, 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 2195731.

It is not a weakly prime, because it can be changed into another prime (2195701) 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, 1097865 + 1097866.

It is an arithmetic number, because the mean of its divisors is an integer number (1097866).

2^2195731 is an apocalyptic number.

2195731 is a deficient number, since it is larger than the sum of its proper divisors (1).

2195731 is an equidigital number, since it uses as much as digits as its factorization.

2195731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1890, while the sum is 28.

The square root of 2195731 is about 1481.7999190174. The cubic root of 2195731 is about 129.9749655936.

It can be divided in two parts, 2195 and 731, that added together give a triangular number (2926 = T₇₆).

The spelling of 2195731 in words is "two million, one hundred ninety-five thousand, seven hundred thirty-one".