100605605 has 4 divisors (see below), whose sum is σ = 120726732. Its totient is φ = 80484480.

The previous prime is 100605601. The next prime is 100605613. The reversal of 100605605 is 506506001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15984004 + 84621601 = 3998^2 + 9199^2 .

It is not a de Polignac number, because 100605605 - 2² = 100605601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100605601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10060556 + ... + 10060565.

It is an arithmetic number, because the mean of its divisors is an integer number (30181683).

Almost surely, 2^100605605 is an apocalyptic number.

It is an amenable number.

100605605 is a deficient number, since it is larger than the sum of its proper divisors (20121127).

100605605 is an equidigital number, since it uses as much as digits as its factorization.

100605605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20121126.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 100605605 is about 10030.2345436186. The cubic root of 100605605 is about 465.0939880157.

The spelling of 100605605 in words is "one hundred million, six hundred five thousand, six hundred five".