812207653 has 2 divisors, whose sum is σ = 812207654. Its totient is φ = 812207652.

The previous prime is 812207621. The next prime is 812207659. The reversal of 812207653 is 356702218.

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., 426752964 + 385454689 = 20658^2 + 19633^2 .

It is a cyclic number.

It is not a de Polignac number, because 812207653 - 2⁵ = 812207621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812207659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406103826 + 406103827.

It is an arithmetic number, because the mean of its divisors is an integer number (406103827).

Almost surely, 2^812207653 is an apocalyptic number.

It is an amenable number.

812207653 is a deficient number, since it is larger than the sum of its proper divisors (1).

812207653 is an equidigital number, since it uses as much as digits as its factorization.

812207653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 812207653 is about 28499.2570604919. The cubic root of 812207653 is about 933.0158590157.

The spelling of 812207653 in words is "eight hundred twelve million, two hundred seven thousand, six hundred fifty-three".