2661917 has 2 divisors, whose sum is σ = 2661918. Its totient is φ = 2661916.

The previous prime is 2661899. The next prime is 2661929. The reversal of 2661917 is 7191662.

It is a happy number.

2661917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2105401 + 556516 = 1451^2 + 746^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661917 - 2⁶ = 2661853 is a prime.

It is a super-2 number, since 2×2661917² = 14171604229778, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330958 + 1330959.

It is an arithmetic number, because the mean of its divisors is an integer number (1330959).

2^2661917 is an apocalyptic number.

It is an amenable number.

2661917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661917 is an equidigital number, since it uses as much as digits as its factorization.

2661917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 32.

The square root of 2661917 is about 1631.5382312407. The cubic root of 2661917 is about 138.5898750679.

The spelling of 2661917 in words is "two million, six hundred sixty-one thousand, nine hundred seventeen".