2172997 has 2 divisors, whose sum is σ = 2172998. Its totient is φ = 2172996.

The previous prime is 2172983. The next prime is 2173001. The reversal of 2172997 is 7992712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1718721 + 454276 = 1311^2 + 674^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172997 - 2⁷ = 2172869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2172917) 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, 1086498 + 1086499.

It is an arithmetic number, because the mean of its divisors is an integer number (1086499).

2^2172997 is an apocalyptic number.

It is an amenable number.

2172997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172997 is an equidigital number, since it uses as much as digits as its factorization.

2172997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15876, while the sum is 37.

The square root of 2172997 is about 1474.1088833597. The cubic root of 2172997 is about 129.5248333686.

The spelling of 2172997 in words is "two million, one hundred seventy-two thousand, nine hundred ninety-seven".