7213649 has 4 divisors (see below), whose sum is σ = 7219764. Its totient is φ = 7207536.

The previous prime is 7213639. The next prime is 7213667. The reversal of 7213649 is 9463127.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9463127 = 1657 ⋅5711.

It can be written as a sum of positive squares in 2 ways, for example, as 490000 + 6723649 = 700^2 + 2593^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7213649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7213639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 662 + ... + 3855.

It is an arithmetic number, because the mean of its divisors is an integer number (1804941).

Almost surely, 2^7213649 is an apocalyptic number.

It is an amenable number.

7213649 is a deficient number, since it is larger than the sum of its proper divisors (6115).

7213649 is a wasteful number, since it uses less digits than its factorization.

7213649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6114.

The product of its digits is 9072, while the sum is 32.

The square root of 7213649 is about 2685.8237097769. The cubic root of 7213649 is about 193.2198180900.

The spelling of 7213649 in words is "seven million, two hundred thirteen thousand, six hundred forty-nine".