812499973 has 2 divisors, whose sum is σ = 812499974. Its totient is φ = 812499972.

The previous prime is 812499971. The next prime is 812499977. The reversal of 812499973 is 379994218.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 615883489 + 196616484 = 24817^2 + 14022^2 .

It is a cyclic number.

It is not a de Polignac number, because 812499973 - 2¹ = 812499971 is a prime.

It is a super-2 number, since 2×812499973² = 1320312412250001458, which contains 22 as substring.

Together with 812499971, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 812499973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812499971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406249986 + 406249987.

It is an arithmetic number, because the mean of its divisors is an integer number (406249987).

Almost surely, 2^812499973 is an apocalyptic number.

It is an amenable number.

812499973 is a deficient number, since it is larger than the sum of its proper divisors (1).

812499973 is an equidigital number, since it uses as much as digits as its factorization.

812499973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 52.

The square root of 812499973 is about 28504.3851538671. The cubic root of 812499973 is about 933.1277788681.

The spelling of 812499973 in words is "eight hundred twelve million, four hundred ninety-nine thousand, nine hundred seventy-three".