2591917 has 2 divisors, whose sum is σ = 2591918. Its totient is φ = 2591916.

The previous prime is 2591899. The next prime is 2591921. The reversal of 2591917 is 7191952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1929321 + 662596 = 1389^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 2591917 - 2¹⁵ = 2559149 is a prime.

2591917 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2591987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1295958 + 1295959.

It is an arithmetic number, because the mean of its divisors is an integer number (1295959).

2^2591917 is an apocalyptic number.

It is an amenable number.

2591917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2591917 is an equidigital number, since it uses as much as digits as its factorization.

2591917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 34.

The square root of 2591917 is about 1609.9431666988. The cubic root of 2591917 is about 137.3642428673.

The spelling of 2591917 in words is "two million, five hundred ninety-one thousand, nine hundred seventeen".