1552225221 has 32 divisors (see below), whose sum is σ = 2370251520. Its totient is φ = 1003223232.

The previous prime is 1552225189. The next prime is 1552225229. The reversal of 1552225221 is 1225222551.

It is a happy number.

It is not a de Polignac number, because 1552225221 - 2⁵ = 1552225189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1552225229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 290056 + ... + 295358.

It is an arithmetic number, because the mean of its divisors is an integer number (74070360).

Almost surely, 2^1552225221 is an apocalyptic number.

It is an amenable number.

1552225221 is a deficient number, since it is larger than the sum of its proper divisors (818026299).

1552225221 is a wasteful number, since it uses less digits than its factorization.

1552225221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5642 (or 5636 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 1552225221 is about 39398.2895694724. The cubic root of 1552225221 is about 1157.8480766625.

Adding to 1552225221 its reverse (1225222551), we get a palindrome (2777447772).

The spelling of 1552225221 in words is "one billion, five hundred fifty-two million, two hundred twenty-five thousand, two hundred twenty-one".