2681657491 has 4 divisors (see below), whose sum is σ = 2684900952. Its totient is φ = 2678414032.

The previous prime is 2681657479. The next prime is 2681657507. The reversal of 2681657491 is 1947561862.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2681657491 - 2¹¹ = 2681655443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2681657411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1620490 + ... + 1622143.

It is an arithmetic number, because the mean of its divisors is an integer number (671225238).

Almost surely, 2^2681657491 is an apocalyptic number.

2681657491 is a deficient number, since it is larger than the sum of its proper divisors (3243461).

2681657491 is an equidigital number, since it uses as much as digits as its factorization.

2681657491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243460.

The product of its digits is 725760, while the sum is 49.

The square root of 2681657491 is about 51784.7225637060. The cubic root of 2681657491 is about 1389.3162088835.

The spelling of 2681657491 in words is "two billion, six hundred eighty-one million, six hundred fifty-seven thousand, four hundred ninety-one".