812418869 has 2 divisors, whose sum is σ = 812418870. Its totient is φ = 812418868.

The previous prime is 812418839. The next prime is 812418881. The reversal of 812418869 is 968814218.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 507916369 + 304502500 = 22537^2 + 17450^2 .

It is a cyclic number.

It is not a de Polignac number, because 812418869 - 2¹² = 812414773 is a prime.

It is a super-2 number, since 2×812418869² = 1320048837414478322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812418809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406209434 + 406209435.

It is an arithmetic number, because the mean of its divisors is an integer number (406209435).

Almost surely, 2^812418869 is an apocalyptic number.

It is an amenable number.

812418869 is a deficient number, since it is larger than the sum of its proper divisors (1).

812418869 is an equidigital number, since it uses as much as digits as its factorization.

812418869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 47.

The square root of 812418869 is about 28502.9624600672. The cubic root of 812418869 is about 933.0967294666.

The spelling of 812418869 in words is "eight hundred twelve million, four hundred eighteen thousand, eight hundred sixty-nine".