5109721 has 2 divisors, whose sum is σ = 5109722. Its totient is φ = 5109720.

The previous prime is 5109719. The next prime is 5109739. The reversal of 5109721 is 1279015.

5109721 is nontrivially palindromic in base 2.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5040025 + 69696 = 2245^2 + 264^2 .

It is a cyclic number.

It is not a de Polignac number, because 5109721 - 2¹ = 5109719 is a prime.

It is a super-2 number, since 2×5109721² = 52218497395682, which contains 22 as substring.

Together with 5109719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (5109751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2554860 + 2554861.

It is an arithmetic number, because the mean of its divisors is an integer number (2554861).

Almost surely, 2^5109721 is an apocalyptic number.

It is an amenable number.

5109721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5109721 is an equidigital number, since it uses as much as digits as its factorization.

5109721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 5109721 is about 2260.4691990823. The cubic root of 5109721 is about 172.2393571266.

The spelling of 5109721 in words is "five million, one hundred nine thousand, seven hundred twenty-one".