812871487 has 2 divisors, whose sum is σ = 812871488. Its totient is φ = 812871486.

The previous prime is 812871469. The next prime is 812871503. The reversal of 812871487 is 784178218.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-812871487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812871187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406435743 + 406435744.

It is an arithmetic number, because the mean of its divisors is an integer number (406435744).

Almost surely, 2^812871487 is an apocalyptic number.

812871487 is a deficient number, since it is larger than the sum of its proper divisors (1).

812871487 is an equidigital number, since it uses as much as digits as its factorization.

812871487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 200704, while the sum is 46.

The square root of 812871487 is about 28510.9011958584. The cubic root of 812871487 is about 933.2699808047.

The spelling of 812871487 in words is "eight hundred twelve million, eight hundred seventy-one thousand, four hundred eighty-seven".