1021663604 has 12 divisors (see below), whose sum is σ = 1925443044. Its totient is φ = 471537024.

The previous prime is 1021663579. The next prime is 1021663609. The reversal of 1021663604 is 4063661201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 414041104 + 607622500 = 20348^2 + 24650^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021663609) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9823637 + ... + 9823740.

It is an arithmetic number, because the mean of its divisors is an integer number (160453587).

Almost surely, 2^1021663604 is an apocalyptic number.

It is an amenable number.

1021663604 is a deficient number, since it is larger than the sum of its proper divisors (903779440).

1021663604 is a wasteful number, since it uses less digits than its factorization.

1021663604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19647394 (or 19647392 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1021663604 is about 31963.4729652458. The cubic root of 1021663604 is about 1007.1696742539.

The spelling of 1021663604 in words is "one billion, twenty-one million, six hundred sixty-three thousand, six hundred four".