1605522061 has 16 divisors (see below), whose sum is σ = 1968220800. Its totient is φ = 1288710720.

The previous prime is 1605522047. The next prime is 1605522071. The reversal of 1605522061 is 1602255061.

It is not a de Polignac number, because 1605522061 - 2⁹ = 1605521549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605522071) 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 15 ways as a sum of consecutive naturals, for example, 240786 + ... + 247363.

It is an arithmetic number, because the mean of its divisors is an integer number (123013800).

Almost surely, 2^1605522061 is an apocalyptic number.

1605522061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1605522061 is a deficient number, since it is larger than the sum of its proper divisors (362698739).

1605522061 is a wasteful number, since it uses less digits than its factorization.

1605522061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488196.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1605522061 is about 40068.9663081043. The cubic root of 1605522061 is about 1170.9511006453.

The spelling of 1605522061 in words is "one billion, six hundred five million, five hundred twenty-two thousand, sixty-one".