1622552221 has 4 divisors (see below), whose sum is σ = 1627228512. Its totient is φ = 1617875932.

The previous prime is 1622552219. The next prime is 1622552251. The reversal of 1622552221 is 1222552261.

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 1622552221 - 2¹ = 1622552219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1622552221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1622552251) 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, 2337625 + ... + 2338318.

It is an arithmetic number, because the mean of its divisors is an integer number (406807128).

Almost surely, 2^1622552221 is an apocalyptic number.

It is an amenable number.

1622552221 is a deficient number, since it is larger than the sum of its proper divisors (4676291).

1622552221 is an equidigital number, since it uses as much as digits as its factorization.

1622552221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4676290.

The product of its digits is 4800, while the sum is 28.

The square root of 1622552221 is about 40280.9163376406. The cubic root of 1622552221 is about 1175.0767346295.

The spelling of 1622552221 in words is "one billion, six hundred twenty-two million, five hundred fifty-two thousand, two hundred twenty-one".