812315761 has 2 divisors, whose sum is σ = 812315762. Its totient is φ = 812315760.

The previous prime is 812315753. The next prime is 812315809. The reversal of 812315761 is 167513218.

It is a happy number.

812315761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 470065761 + 342250000 = 21681^2 + 18500^2 .

It is a cyclic number.

It is not a de Polignac number, because 812315761 - 2³ = 812315753 is a prime.

It is not a weakly prime, because it can be changed into another prime (812315741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406157880 + 406157881.

It is an arithmetic number, because the mean of its divisors is an integer number (406157881).

Almost surely, 2^812315761 is an apocalyptic number.

It is an amenable number.

812315761 is a deficient number, since it is larger than the sum of its proper divisors (1).

812315761 is an equidigital number, since it uses as much as digits as its factorization.

812315761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 34.

The square root of 812315761 is about 28501.1536784040. The cubic root of 812315761 is about 933.0572531933.

Adding to 812315761 its reverse (167513218), we get a palindrome (979828979).

It can be divided in two parts, 8123157 and 61, that added together give a palindrome (8123218).

The spelling of 812315761 in words is "eight hundred twelve million, three hundred fifteen thousand, seven hundred sixty-one".