7217225 has 6 divisors (see below), whose sum is σ = 8949390. Its totient is φ = 5773760.

The previous prime is 7217219. The next prime is 7217237. The reversal of 7217225 is 5227127.

It can be written as a sum of positive squares in 3 ways, for example, as 678976 + 6538249 = 824^2 + 2557^2 .

It is not a de Polignac number, because 7217225 - 2²⁰ = 6168649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7217194 and 7217203.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 144320 + ... + 144369.

It is an arithmetic number, because the mean of its divisors is an integer number (1491565).

Almost surely, 2^7217225 is an apocalyptic number.

It is an amenable number.

7217225 is a deficient number, since it is larger than the sum of its proper divisors (1732165).

7217225 is a wasteful number, since it uses less digits than its factorization.

7217225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288699 (or 288694 counting only the distinct ones).

The product of its digits is 1960, while the sum is 26.

The square root of 7217225 is about 2686.4893448514. The cubic root of 7217225 is about 193.2517409040.

The spelling of 7217225 in words is "seven million, two hundred seventeen thousand, two hundred twenty-five".