1553621056 has 63 divisors (see below), whose sum is σ = 3347192061. Its totient is φ = 715163904.

The previous prime is 1553621053. The next prime is 1553621057. The reversal of 1553621056 is 6501263551.

The square root of 1553621056 is 39416.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 229825600 + 1323795456 = 15160^2 + 36384^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1553621053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4099075 + ... + 4099453.

Almost surely, 2^1553621056 is an apocalyptic number.

1553621056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1553621056 is the 39416-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1553621056

1553621056 is an abundant number, since it is smaller than the sum of its proper divisors (1793571005).

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

1553621056 is an frugal number, since it uses more digits than its factorization.

1553621056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796 (or 394 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The cubic root of 1553621056 is about 1158.1950367656.

The spelling of 1553621056 in words is "one billion, five hundred fifty-three million, six hundred twenty-one thousand, fifty-six".