4721999 has 2 divisors, whose sum is σ = 4722000. Its totient is φ = 4721998.

The previous prime is 4721963. The next prime is 4722001. The reversal of 4721999 is 9991274.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4721999 is a prime.

Together with 4722001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4726999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2360999 + 2361000.

It is an arithmetic number, because the mean of its divisors is an integer number (2361000).

Almost surely, 2^4721999 is an apocalyptic number.

4721999 is a deficient number, since it is larger than the sum of its proper divisors (1).

4721999 is an equidigital number, since it uses as much as digits as its factorization.

4721999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 41.

The square root of 4721999 is about 2173.0161067051. The cubic root of 4721999 is about 167.7678080157.

The spelling of 4721999 in words is "four million, seven hundred twenty-one thousand, nine hundred ninety-nine".