1001611605 has 16 divisors (see below), whose sum is σ = 1603039104. Its totient is φ = 534039360.

The previous prime is 1001611579. The next prime is 1001611651. The reversal of 1001611605 is 5061161001.

It is not a de Polignac number, because 1001611605 - 2¹⁷ = 1001480533 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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61195 + ... + 75815.

It is an arithmetic number, because the mean of its divisors is an integer number (100189944).

Almost surely, 2^1001611605 is an apocalyptic number.

1001611605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1001611605 is a deficient number, since it is larger than the sum of its proper divisors (601427499).

1001611605 is a wasteful number, since it uses less digits than its factorization.

1001611605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19196.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 1001611605 is about 31648.2480557771. The cubic root of 1001611605 is about 1000.5369133391.

Adding to 1001611605 its reverse (5061161001), we get a palindrome (6062772606).

The spelling of 1001611605 in words is "one billion, one million, six hundred eleven thousand, six hundred five".