7221499997 has 2 divisors, whose sum is σ = 7221499998. Its totient is φ = 7221499996.

The previous prime is 7221499949. The next prime is 7221500009. The reversal of 7221499997 is 7999941227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5992927396 + 1228572601 = 77414^2 + 35051^2 .

It is an emirp because it is prime and its reverse (7999941227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7221499997 - 2¹² = 7221495901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7221499297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610749998 + 3610749999.

It is an arithmetic number, because the mean of its divisors is an integer number (3610749999).

Almost surely, 2^7221499997 is an apocalyptic number.

It is an amenable number.

7221499997 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221499997 is an equidigital number, since it uses as much as digits as its factorization.

7221499997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5143824, while the sum is 59.

The square root of 7221499997 is about 84979.4092530655. The cubic root of 7221499997 is about 1932.8988980231.

The spelling of 7221499997 in words is "seven billion, two hundred twenty-one million, four hundred ninety-nine thousand, nine hundred ninety-seven".