100512805 has 8 divisors (see below), whose sum is σ = 120684312. Its totient is φ = 80364288.

The previous prime is 100512787. The next prime is 100512817. The reversal of 100512805 is 508215001.

It can be written as a sum of positive squares in 4 ways, for example, as 11512449 + 89000356 = 3393^2 + 9434^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100512805 - 2⁷ = 100512677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6097 + ... + 15433.

It is an arithmetic number, because the mean of its divisors is an integer number (15085539).

Almost surely, 2^100512805 is an apocalyptic number.

It is an amenable number.

100512805 is a deficient number, since it is larger than the sum of its proper divisors (20171507).

100512805 is an equidigital number, since it uses as much as digits as its factorization.

100512805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11495.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 100512805 is about 10025.6074628922. The cubic root of 100512805 is about 464.9509409838.

Adding to 100512805 its reverse (508215001), we get a palindrome (608727806).

The spelling of 100512805 in words is "one hundred million, five hundred twelve thousand, eight hundred five".