812305261 has 2 divisors, whose sum is σ = 812305262. Its totient is φ = 812305260.

The previous prime is 812305231. The next prime is 812305267. The reversal of 812305261 is 162503218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 634082761 + 178222500 = 25181^2 + 13350^2 .

It is a cyclic number.

It is not a de Polignac number, because 812305261 - 2⁵ = 812305229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812305267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406152630 + 406152631.

It is an arithmetic number, because the mean of its divisors is an integer number (406152631).

Almost surely, 2^812305261 is an apocalyptic number.

It is an amenable number.

812305261 is a deficient number, since it is larger than the sum of its proper divisors (1).

812305261 is an equidigital number, since it uses as much as digits as its factorization.

812305261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 812305261 is about 28500.9694747389. The cubic root of 812305261 is about 933.0532329408.

Adding to 812305261 its reverse (162503218), we get a palindrome (974808479).

The spelling of 812305261 in words is "eight hundred twelve million, three hundred five thousand, two hundred sixty-one".