100231605 has 12 divisors (see below), whose sum is σ = 173734860. Its totient is φ = 53456832.

The previous prime is 100231597. The next prime is 100231613. The reversal of 100231605 is 506132001.

It is an interprime number because it is at equal distance from previous prime (100231597) and next prime (100231613).

It can be written as a sum of positive squares in 2 ways, for example, as 73667889 + 26563716 = 8583^2 + 5154^2 .

It is not a de Polignac number, because 100231605 - 2³ = 100231597 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 11 ways as a sum of consecutive naturals, for example, 1113640 + ... + 1113729.

It is an arithmetic number, because the mean of its divisors is an integer number (14477905).

Almost surely, 2^100231605 is an apocalyptic number.

100231605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

100231605 is a deficient number, since it is larger than the sum of its proper divisors (73503255).

100231605 is a wasteful number, since it uses less digits than its factorization.

100231605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2227380 (or 2227377 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 100231605 is about 10011.5735526440. The cubic root of 100231605 is about 464.5169454674.

Adding to 100231605 its reverse (506132001), we get a palindrome (606363606).

It can be divided in two parts, 10023 and 1605, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 100231605 in words is "one hundred million, two hundred thirty-one thousand, six hundred five".