22147997 has 2 divisors, whose sum is σ = 22147998. Its totient is φ = 22147996.

The previous prime is 22147963. The next prime is 22148023. The reversal of 22147997 is 79974122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21473956 + 674041 = 4634^2 + 821^2 .

It is a cyclic number.

It is not a de Polignac number, because 22147997 - 2⁶ = 22147933 is a prime.

It is a super-2 number, since 2×22147997² = 981067542224018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22147907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11073998 + 11073999.

It is an arithmetic number, because the mean of its divisors is an integer number (11073999).

Almost surely, 2^22147997 is an apocalyptic number.

It is an amenable number.

22147997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22147997 is an equidigital number, since it uses as much as digits as its factorization.

22147997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 41.

The square root of 22147997 is about 4706.1658491813. The cubic root of 22147997 is about 280.8308527245.

The spelling of 22147997 in words is "twenty-two million, one hundred forty-seven thousand, nine hundred ninety-seven".