2498647721 has 4 divisors (see below), whose sum is σ = 2498978244. Its totient is φ = 2498317200.

The previous prime is 2498647693. The next prime is 2498647813. The reversal of 2498647721 is 1277468942.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 400000000 + 2098647721 = 20000^2 + 45811^2 .

It is a cyclic number.

It is not a de Polignac number, because 2498647721 - 2¹⁴ = 2498631337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2498647721.

It is not an unprimeable number, because it can be changed into a prime (2498647121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153650 + ... + 169131.

It is an arithmetic number, because the mean of its divisors is an integer number (624744561).

Almost surely, 2^2498647721 is an apocalyptic number.

It is an amenable number.

2498647721 is a deficient number, since it is larger than the sum of its proper divisors (330523).

2498647721 is an equidigital number, since it uses as much as digits as its factorization.

2498647721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330522.

The product of its digits is 1354752, while the sum is 50.

The square root of 2498647721 is about 49986.4753808468. The cubic root of 2498647721 is about 1356.9640541660.

The spelling of 2498647721 in words is "two billion, four hundred ninety-eight million, six hundred forty-seven thousand, seven hundred twenty-one".