7221557 has 8 divisors (see below), whose sum is σ = 8269632. Its totient is φ = 6177600.

The previous prime is 7221547. The next prime is 7221569. The reversal of 7221557 is 7551227.

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

It is a cyclic number.

It is not a de Polignac number, because 7221557 - 2⁸ = 7221301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5582 + ... + 6752.

It is an arithmetic number, because the mean of its divisors is an integer number (1033704).

Almost surely, 2^7221557 is an apocalyptic number.

It is an amenable number.

7221557 is a deficient number, since it is larger than the sum of its proper divisors (1048075).

7221557 is a wasteful number, since it uses less digits than its factorization.

7221557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059.

The product of its digits is 4900, while the sum is 29.

The square root of 7221557 is about 2687.2954805901. The cubic root of 7221557 is about 193.2903983797.

The spelling of 7221557 in words is "seven million, two hundred twenty-one thousand, five hundred fifty-seven".