4987721 has 2 divisors, whose sum is σ = 4987722. Its totient is φ = 4987720.

The previous prime is 4987693. The next prime is 4987729. The reversal of 4987721 is 1277894.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3013696 + 1974025 = 1736^2 + 1405^2 .

It is a cyclic number.

It is not a de Polignac number, because 4987721 - 2⁶ = 4987657 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (4987729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2493860 + 2493861.

It is an arithmetic number, because the mean of its divisors is an integer number (2493861).

Almost surely, 2^4987721 is an apocalyptic number.

It is an amenable number.

4987721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4987721 is an equidigital number, since it uses as much as digits as its factorization.

4987721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 38.

The square root of 4987721 is about 2233.3206218544. The cubic root of 4987721 is about 170.8575012936.

The spelling of 4987721 in words is "four million, nine hundred eighty-seven thousand, seven hundred twenty-one".