111010001605 has 4 divisors (see below), whose sum is σ = 133212001932. Its totient is φ = 88808001280.

The previous prime is 111010001593. The next prime is 111010001611. The reversal of 111010001605 is 506100010111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506100010111 = 43 ⋅11769767677.

It can be written as a sum of positive squares in 2 ways, for example, as 19321556004 + 91688445601 = 139002^2 + 302801^2 .

It is not a de Polignac number, because 111010001605 - 2⁷ = 111010001477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11101000156 + ... + 11101000165.

It is an arithmetic number, because the mean of its divisors is an integer number (33303000483).

Almost surely, 2^111010001605 is an apocalyptic number.

It is an amenable number.

111010001605 is a deficient number, since it is larger than the sum of its proper divisors (22202000327).

111010001605 is an equidigital number, since it uses as much as digits as its factorization.

111010001605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22202000326.

The product of its (nonzero) digits is 30, while the sum is 16.

Adding to 111010001605 its reverse (506100010111), we get a palindrome (617110011716).

The spelling of 111010001605 in words is "one hundred eleven billion, ten million, one thousand, six hundred five".