812216447 has 16 divisors (see below), whose sum is σ = 957422592. Its totient is φ = 674599200.

The previous prime is 812216423. The next prime is 812216453. The reversal of 812216447 is 744612218.

It is not a de Polignac number, because 812216447 - 2¹⁰ = 812215423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812216407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21008 + ... + 45450.

It is an arithmetic number, because the mean of its divisors is an integer number (59838912).

Almost surely, 2^812216447 is an apocalyptic number.

812216447 is a deficient number, since it is larger than the sum of its proper divisors (145206145).

812216447 is a wasteful number, since it uses less digits than its factorization.

812216447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24598.

The product of its digits is 21504, while the sum is 35.

The square root of 812216447 is about 28499.4113447980. The cubic root of 812216447 is about 933.0192263449.

The spelling of 812216447 in words is "eight hundred twelve million, two hundred sixteen thousand, four hundred forty-seven".