812105729 has 4 divisors (see below), whose sum is σ = 838302720. Its totient is φ = 785908740.

The previous prime is 812105717. The next prime is 812105741. The reversal of 812105729 is 927501218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (812105717) and next prime (812105741).

It is a cyclic number.

It is not a de Polignac number, because 812105729 - 2⁴ = 812105713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812105779) 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, 13098449 + ... + 13098510.

It is an arithmetic number, because the mean of its divisors is an integer number (209575680).

Almost surely, 2^812105729 is an apocalyptic number.

It is an amenable number.

812105729 is a deficient number, since it is larger than the sum of its proper divisors (26196991).

812105729 is a wasteful number, since it uses less digits than its factorization.

812105729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26196990.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 812105729 is about 28497.4688174231. The cubic root of 812105729 is about 932.9768293060.

The spelling of 812105729 in words is "eight hundred twelve million, one hundred five thousand, seven hundred twenty-nine".