2660491 has 4 divisors (see below), whose sum is σ = 2664000. Its totient is φ = 2656984.

The previous prime is 2660473. The next prime is 2660509. The reversal of 2660491 is 1940662.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (2660473) and next prime (2660509).

It is a cyclic number.

It is not a de Polignac number, because 2660491 - 2¹⁷ = 2529419 is a prime.

It is a super-2 number, since 2×2660491² = 14156424722162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2660401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91 + ... + 2308.

It is an arithmetic number, because the mean of its divisors is an integer number (666000).

2^2660491 is an apocalyptic number.

2660491 is a deficient number, since it is larger than the sum of its proper divisors (3509).

2660491 is a wasteful number, since it uses less digits than its factorization.

2660491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3508.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 2660491 is about 1631.1011617922. The cubic root of 2660491 is about 138.5651229234.

The spelling of 2660491 in words is "two million, six hundred sixty thousand, four hundred ninety-one".