8221501 has 4 divisors (see below), whose sum is σ = 8303004. Its totient is φ = 8140000.

The previous prime is 8221487. The next prime is 8221513. The reversal of 8221501 is 1051228.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7150276 + 1071225 = 2674^2 + 1035^2 .

It is a cyclic number.

It is not a de Polignac number, because 8221501 - 2⁵ = 8221469 is a prime.

It is a Duffinian number.

8221501 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221561) 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, 40600 + ... + 40801.

It is an arithmetic number, because the mean of its divisors is an integer number (2075751).

Almost surely, 2^8221501 is an apocalyptic number.

It is an amenable number.

8221501 is a deficient number, since it is larger than the sum of its proper divisors (81503).

8221501 is a wasteful number, since it uses less digits than its factorization.

8221501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81502.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 8221501 is about 2867.3159923524. The cubic root of 8221501 is about 201.8290633113.

Adding to 8221501 its reverse (1051228), we get a palindrome (9272729).

The spelling of 8221501 in words is "eight million, two hundred twenty-one thousand, five hundred one".