7221499 has 2 divisors, whose sum is σ = 7221500. Its totient is φ = 7221498.

The previous prime is 7221457. The next prime is 7221509. The reversal of 7221499 is 9941227.

It is a happy number.

7221499 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (9941227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7221499 - 2¹³ = 7213307 is a prime.

It is not a weakly prime, because it can be changed into another prime (7221439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610749 + 3610750.

It is an arithmetic number, because the mean of its divisors is an integer number (3610750).

Almost surely, 2^7221499 is an apocalyptic number.

7221499 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221499 is an equidigital number, since it uses as much as digits as its factorization.

7221499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 7221499 is about 2687.2846890495. The cubic root of 7221499 is about 193.2898809071.

The spelling of 7221499 in words is "seven million, two hundred twenty-one thousand, four hundred ninety-nine".