999962221 has 4 divisors (see below), whose sum is σ = 1000037052. Its totient is φ = 999887392.

The previous prime is 999962209. The next prime is 999962231. The reversal of 999962221 is 122269999.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122269999 = 173 ⋅706763.

It can be written as a sum of positive squares in 2 ways, for example, as 529506121 + 470456100 = 23011^2 + 21690^2 .

It is a cyclic number.

It is not a de Polignac number, because 999962221 - 2²⁷ = 865744493 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 (999962231) 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, 11290 + ... + 46123.

It is an arithmetic number, because the mean of its divisors is an integer number (250009263).

Almost surely, 2^999962221 is an apocalyptic number.

It is an amenable number.

999962221 is a deficient number, since it is larger than the sum of its proper divisors (74831).

999962221 is a wasteful number, since it uses less digits than its factorization.

999962221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74830.

The product of its digits is 314928, while the sum is 49.

The square root of 999962221 is about 31622.1792576034. The cubic root of 999962221 is about 999.9874068414.

The spelling of 999962221 in words is "nine hundred ninety-nine million, nine hundred sixty-two thousand, two hundred twenty-one".