2172791 has 2 divisors, whose sum is σ = 2172792. Its totient is φ = 2172790.

The previous prime is 2172773. The next prime is 2172799. The reversal of 2172791 is 1972712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2172791 - 2⁶ = 2172727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2172799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086395 + 1086396.

It is an arithmetic number, because the mean of its divisors is an integer number (1086396).

2^2172791 is an apocalyptic number.

2172791 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172791 is an equidigital number, since it uses as much as digits as its factorization.

2172791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764, while the sum is 29.

The square root of 2172791 is about 1474.0390089818. The cubic root of 2172791 is about 129.5207402568.

The spelling of 2172791 in words is "two million, one hundred seventy-two thousand, seven hundred ninety-one".