2391709 has 2 divisors, whose sum is σ = 2391710. Its totient is φ = 2391708.

The previous prime is 2391691. The next prime is 2391721. The reversal of 2391709 is 9071932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1664100 + 727609 = 1290^2 + 853^2 .

It is a cyclic number.

It is not a de Polignac number, because 2391709 - 2¹¹ = 2389661 is a prime.

It is an Ulam number.

It is equal to p₁₇₅₇₃₈ and since 2391709 and 175738 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2391769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1195854 + 1195855.

It is an arithmetic number, because the mean of its divisors is an integer number (1195855).

2^2391709 is an apocalyptic number.

It is an amenable number.

2391709 is a deficient number, since it is larger than the sum of its proper divisors (1).

2391709 is an equidigital number, since it uses as much as digits as its factorization.

2391709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 2391709 is about 1546.5151147014. The cubic root of 2391709 is about 133.7322380117.

The spelling of 2391709 in words is "two million, three hundred ninety-one thousand, seven hundred nine".