1606486561 has 9 divisors (see below), whose sum is σ = 1623375481. Its totient is φ = 1589772784.

The previous prime is 1606486547. The next prime is 1606486591. The reversal of 1606486561 is 1656846061.

The square root of 1606486561 is 40081.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1081160161 + 525326400 = 32881^2 + 22920^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1606486561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1606486501) 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 8 ways as a sum of consecutive naturals, for example, 5971935 + ... + 5972203.

Almost surely, 2^1606486561 is an apocalyptic number.

1606486561 is the 40081-st square number.

1606486561 is the 20041-st centered octagonal number.

It is an amenable number.

1606486561 is a deficient number, since it is larger than the sum of its proper divisors (16888920).

1606486561 is an frugal number, since it uses more digits than its factorization.

1606486561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The cubic root of 1606486561 is about 1171.1855324406.

The spelling of 1606486561 in words is "one billion, six hundred six million, four hundred eighty-six thousand, five hundred sixty-one".