3123552221 has 4 divisors (see below), whose sum is σ = 3134589792. Its totient is φ = 3112514652.

The previous prime is 3123552169. The next prime is 3123552227. The reversal of 3123552221 is 1222553213.

It is a happy number.

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 3123552221 - 2¹⁸ = 3123290077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3123552227) 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, 5518361 + ... + 5518926.

It is an arithmetic number, because the mean of its divisors is an integer number (783647448).

Almost surely, 2^3123552221 is an apocalyptic number.

It is an amenable number.

3123552221 is a deficient number, since it is larger than the sum of its proper divisors (11037571).

3123552221 is a wasteful number, since it uses less digits than its factorization.

3123552221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11037570.

The product of its digits is 3600, while the sum is 26.

The square root of 3123552221 is about 55888.7486082843. The cubic root of 3123552221 is about 1461.7830565519.

The spelling of 3123552221 in words is "three billion, one hundred twenty-three million, five hundred fifty-two thousand, two hundred twenty-one".