812012105 has 8 divisors (see below), whose sum is σ = 975997512. Its totient is φ = 648554368.

The previous prime is 812012087. The next prime is 812012107. The reversal of 812012105 is 501210218.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12988816 + 799023289 = 3604^2 + 28267^2 .

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 812012105 - 2⁶ = 812012041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812012107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128522 + ... + 134691.

It is an arithmetic number, because the mean of its divisors is an integer number (121999689).

Almost surely, 2^812012105 is an apocalyptic number.

It is an amenable number.

812012105 is a deficient number, since it is larger than the sum of its proper divisors (163985407).

812012105 is a wasteful number, since it uses less digits than its factorization.

812012105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263835.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 812012105 is about 28495.8260978691. The cubic root of 812012105 is about 932.9409750338.

The spelling of 812012105 in words is "eight hundred twelve million, twelve thousand, one hundred five".