7213522 has 8 divisors (see below), whose sum is σ = 10889676. Its totient is φ = 3583632.

The previous prime is 7213487. The next prime is 7213541. The reversal of 7213522 is 2253127.

It can be written as a sum of positive squares in 2 ways, for example, as 7177041 + 36481 = 2679^2 + 191^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 7213493 and 7213502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11173 + ... + 11800.

Almost surely, 2^7213522 is an apocalyptic number.

7213522 is a deficient number, since it is larger than the sum of its proper divisors (3676154).

7213522 is a wasteful number, since it uses less digits than its factorization.

7213522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23132.

The product of its digits is 840, while the sum is 22.

The square root of 7213522 is about 2685.8000670191. The cubic root of 7213522 is about 193.2186841719.

Adding to 7213522 its reverse (2253127), we get a palindrome (9466649).

The spelling of 7213522 in words is "seven million, two hundred thirteen thousand, five hundred twenty-two".