2666491 has 2 divisors, whose sum is σ = 2666492. Its totient is φ = 2666490.

The previous prime is 2666453. The next prime is 2666507. The reversal of 2666491 is 1946662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2666491 - 2¹¹ = 2664443 is a prime.

It is a super-2 number, since 2×2666491² = 14220348506162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2666291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333245 + 1333246.

It is an arithmetic number, because the mean of its divisors is an integer number (1333246).

2^2666491 is an apocalyptic number.

2666491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666491 is an equidigital number, since it uses as much as digits as its factorization.

2666491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 2666491 is about 1632.9393742574. The cubic root of 2666491 is about 138.6692097917.

The spelling of 2666491 in words is "two million, six hundred sixty-six thousand, four hundred ninety-one".