7149209 has 2 divisors, whose sum is σ = 7149210. Its totient is φ = 7149208.

The previous prime is 7149193. The next prime is 7149221. The reversal of 7149209 is 9029417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4579600 + 2569609 = 2140^2 + 1603^2 .

It is an emirp because it is prime and its reverse (9029417) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7149209 - 2⁴ = 7149193 is a prime.

It is a super-2 number, since 2×7149209² = 102222378651362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7149239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3574604 + 3574605.

It is an arithmetic number, because the mean of its divisors is an integer number (3574605).

Almost surely, 2^7149209 is an apocalyptic number.

It is an amenable number.

7149209 is a deficient number, since it is larger than the sum of its proper divisors (1).

7149209 is an equidigital number, since it uses as much as digits as its factorization.

7149209 is an evil number, because the sum of its binary digits is even.

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

The square root of 7149209 is about 2673.8004787194. The cubic root of 7149209 is about 192.6427478891.

The spelling of 7149209 in words is "seven million, one hundred forty-nine thousand, two hundred nine".