812213693 has 2 divisors, whose sum is σ = 812213694. Its totient is φ = 812213692.

The previous prime is 812213687. The next prime is 812213707. The reversal of 812213693 is 396312218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 544662244 + 267551449 = 23338^2 + 16357^2 .

It is a cyclic number.

It is not a de Polignac number, because 812213693 - 2¹² = 812209597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812213683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406106846 + 406106847.

It is an arithmetic number, because the mean of its divisors is an integer number (406106847).

Almost surely, 2^812213693 is an apocalyptic number.

It is an amenable number.

812213693 is a deficient number, since it is larger than the sum of its proper divisors (1).

812213693 is an equidigital number, since it uses as much as digits as its factorization.

812213693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The square root of 812213693 is about 28499.3630279696. The cubic root of 812213693 is about 933.0181718075.

The spelling of 812213693 in words is "eight hundred twelve million, two hundred thirteen thousand, six hundred ninety-three".