1564221126 has 64 divisors (see below), whose sum is σ = 3488808960. Its totient is φ = 464296320.

The previous prime is 1564221083. The next prime is 1564221137. The reversal of 1564221126 is 6211224651.

It is a junction number, because it is equal to n+sod(n) for n = 1564221093 and 1564221102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 939771 + ... + 941433.

It is an arithmetic number, because the mean of its divisors is an integer number (54512640).

Almost surely, 2^1564221126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1564221126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1744404480).

1564221126 is an abundant number, since it is smaller than the sum of its proper divisors (1924587834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1564221126 is a wasteful number, since it uses less digits than its factorization.

1564221126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101.

The product of its digits is 5760, while the sum is 30.

The square root of 1564221126 is about 39550.2354733825. The cubic root of 1564221126 is about 1160.8231192168.

Adding to 1564221126 its reverse (6211224651), we get a palindrome (7775445777).

The spelling of 1564221126 in words is "one billion, five hundred sixty-four million, two hundred twenty-one thousand, one hundred twenty-six".