7216657 has 4 divisors (see below), whose sum is σ = 8247616. Its totient is φ = 6185700.

The previous prime is 7216633. The next prime is 7216661. The reversal of 7216657 is 7566127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7566127 = 919 ⋅8233.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7216657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7216667) by changing a digit.

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, 515469 + ... + 515482.

It is an arithmetic number, because the mean of its divisors is an integer number (2061904).

Almost surely, 2^7216657 is an apocalyptic number.

It is an amenable number.

7216657 is a deficient number, since it is larger than the sum of its proper divisors (1030959).

7216657 is a wasteful number, since it uses less digits than its factorization.

7216657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030958.

The product of its digits is 17640, while the sum is 34.

The square root of 7216657 is about 2686.3836285981. The cubic root of 7216657 is about 193.2466710945.

The spelling of 7216657 in words is "seven million, two hundred sixteen thousand, six hundred fifty-seven".