7142209 has 2 divisors, whose sum is σ = 7142210. Its totient is φ = 7142208.

The previous prime is 7142203. The next prime is 7142263. The reversal of 7142209 is 9022417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6656400 + 485809 = 2580^2 + 697^2 .

It is a cyclic number.

It is not a de Polignac number, because 7142209 - 2¹⁹ = 6617921 is a prime.

It is a super-2 number, since 2×7142209² = 102022298799362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7142203) 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, 3571104 + 3571105.

It is an arithmetic number, because the mean of its divisors is an integer number (3571105).

Almost surely, 2^7142209 is an apocalyptic number.

It is an amenable number.

7142209 is a deficient number, since it is larger than the sum of its proper divisors (1).

7142209 is an equidigital number, since it uses as much as digits as its factorization.

7142209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 7142209 is about 2672.4911599480. The cubic root of 7142209 is about 192.5798533044.

The spelling of 7142209 in words is "seven million, one hundred forty-two thousand, two hundred nine".