1556221036 has 12 divisors (see below), whose sum is σ = 2796992128. Its totient is φ = 757080432.

The previous prime is 1556221031. The next prime is 1556221039. The reversal of 1556221036 is 6301226551.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1556220989 and 1556221007.

It is not an unprimeable number, because it can be changed into a prime (1556221031) 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, 5257356 + ... + 5257651.

Almost surely, 2^1556221036 is an apocalyptic number.

It is an amenable number.

1556221036 is a deficient number, since it is larger than the sum of its proper divisors (1240771092).

1556221036 is a wasteful number, since it uses less digits than its factorization.

1556221036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10515048 (or 10515046 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 1556221036 is about 39448.9674896568. The cubic root of 1556221036 is about 1158.8407552928.

Adding to 1556221036 its reverse (6301226551), we get a palindrome (7857447587).

The spelling of 1556221036 in words is "one billion, five hundred fifty-six million, two hundred twenty-one thousand, thirty-six".