1611061605 has 24 divisors (see below), whose sum is σ = 2820163320. Its totient is φ = 850723200.

The previous prime is 1611061591. The next prime is 1611061631. The reversal of 1611061605 is 5061601161.

It can be written as a sum of positive squares in 4 ways, for example, as 461648196 + 1149413409 = 21486^2 + 33903^2 .

It is not a de Polignac number, because 1611061605 - 2⁴ = 1611061589 is a prime.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 172690 + ... + 181779.

It is an arithmetic number, because the mean of its divisors is an integer number (117506805).

Almost surely, 2^1611061605 is an apocalyptic number.

1611061605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1611061605 is a deficient number, since it is larger than the sum of its proper divisors (1209101715).

1611061605 is a wasteful number, since it uses less digits than its factorization.

1611061605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354581 (or 354578 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1611061605 is about 40138.0319024239. The cubic root of 1611061605 is about 1172.2962683407.

Adding to 1611061605 its reverse (5061601161), we get a palindrome (6672662766).

The spelling of 1611061605 in words is "one billion, six hundred eleven million, sixty-one thousand, six hundred five".