2499024721 has 4 divisors (see below), whose sum is σ = 2499708772. Its totient is φ = 2498340672.

The previous prime is 2499024713. The next prime is 2499024739. The reversal of 2499024721 is 1274209942.

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 248850625 + 2250174096 = 15775^2 + 47436^2 .

It is a cyclic number.

It is not a de Polignac number, because 2499024721 - 2³ = 2499024713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2499024821) 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, 336516 + ... + 343861.

It is an arithmetic number, because the mean of its divisors is an integer number (624927193).

Almost surely, 2^2499024721 is an apocalyptic number.

It is an amenable number.

2499024721 is a deficient number, since it is larger than the sum of its proper divisors (684051).

2499024721 is an equidigital number, since it uses as much as digits as its factorization.

2499024721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684050.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 2499024721 is about 49990.2462586453. The cubic root of 2499024721 is about 1357.0322977093.

The spelling of 2499024721 in words is "two billion, four hundred ninety-nine million, twenty-four thousand, seven hundred twenty-one".