2221997 has 2 divisors, whose sum is σ = 2221998. Its totient is φ = 2221996.

The previous prime is 2221991. The next prime is 2222023. The reversal of 2221997 is 7991222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1901641 + 320356 = 1379^2 + 566^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221997 - 2⁴ = 2221981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110998 + 1110999.

It is an arithmetic number, because the mean of its divisors is an integer number (1110999).

2^2221997 is an apocalyptic number.

It is an amenable number.

2221997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221997 is an equidigital number, since it uses as much as digits as its factorization.

2221997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 32.

The square root of 2221997 is about 1490.6364412559. The cubic root of 2221997 is about 130.4911793141.

The spelling of 2221997 in words is "two million, two hundred twenty-one thousand, nine hundred ninety-seven".