992221 has 4 divisors (see below), whose sum is σ = 998944. Its totient is φ = 985500.

The previous prime is 992219. The next prime is 992231. The reversal of 992221 is 122299.

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.

It is a cyclic number.

It is not a de Polignac number, because 992221 - 2¹ = 992219 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (992231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3135 + ... + 3436.

It is an arithmetic number, because the mean of its divisors is an integer number (249736).

2⁹⁹²²²¹ is an apocalyptic number.

It is an amenable number.

992221 is a deficient number, since it is larger than the sum of its proper divisors (6723).

992221 is a wasteful number, since it uses less digits than its factorization.

992221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6722.

The product of its digits is 648, while the sum is 25.

The square root of 992221 is about 996.1029063305. The cubic root of 992221 is about 99.7400247142.

The spelling of 992221 in words is "nine hundred ninety-two thousand, two hundred twenty-one".