812489729 has 2 divisors, whose sum is σ = 812489730. Its totient is φ = 812489728.

The previous prime is 812489701. The next prime is 812489731. The reversal of 812489729 is 927984218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 531994225 + 280495504 = 23065^2 + 16748^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-812489729 is a prime.

Together with 812489731, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (812489779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406244864 + 406244865.

It is an arithmetic number, because the mean of its divisors is an integer number (406244865).

Almost surely, 2^812489729 is an apocalyptic number.

It is an amenable number.

812489729 is a deficient number, since it is larger than the sum of its proper divisors (1).

812489729 is an equidigital number, since it uses as much as digits as its factorization.

812489729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 50.

The square root of 812489729 is about 28504.2054616507. The cubic root of 812489729 is about 933.1238572265.

The spelling of 812489729 in words is "eight hundred twelve million, four hundred eighty-nine thousand, seven hundred twenty-nine".