8221951 has 4 divisors (see below), whose sum is σ = 8228952. Its totient is φ = 8214952.

The previous prime is 8221949. The next prime is 8221963. The reversal of 8221951 is 1591228.

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.

It is a cyclic number.

It is not a de Polignac number, because 8221951 - 2¹ = 8221949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221921) 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, 1261 + ... + 4246.

It is an arithmetic number, because the mean of its divisors is an integer number (2057238).

Almost surely, 2^8221951 is an apocalyptic number.

8221951 is a deficient number, since it is larger than the sum of its proper divisors (7001).

8221951 is a wasteful number, since it uses less digits than its factorization.

8221951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000.

The product of its digits is 1440, while the sum is 28.

The square root of 8221951 is about 2867.3944618765. The cubic root of 8221951 is about 201.8327455839.

The spelling of 8221951 in words is "eight million, two hundred twenty-one thousand, nine hundred fifty-one".