812499997 has 2 divisors, whose sum is σ = 812499998. Its totient is φ = 812499996.

The previous prime is 812499977. The next prime is 812500027. The reversal of 812499997 is 799994218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 775399716 + 37100281 = 27846^2 + 6091^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-812499997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812499937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406249998 + 406249999.

It is an arithmetic number, because the mean of its divisors is an integer number (406249999).

Almost surely, 2^812499997 is an apocalyptic number.

It is an amenable number.

812499997 is a deficient number, since it is larger than the sum of its proper divisors (1).

812499997 is an equidigital number, since it uses as much as digits as its factorization.

812499997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 58.

The square root of 812499997 is about 28504.3855748550. The cubic root of 812499997 is about 933.1277880558.

The spelling of 812499997 in words is "eight hundred twelve million, four hundred ninety-nine thousand, nine hundred ninety-seven".