812381971 has 2 divisors, whose sum is σ = 812381972. Its totient is φ = 812381970.

The previous prime is 812381903. The next prime is 812381989. The reversal of 812381971 is 179183218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 812381971 - 2²⁷ = 678164243 is a prime.

It is not a weakly prime, because it can be changed into another prime (812382971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406190985 + 406190986.

It is an arithmetic number, because the mean of its divisors is an integer number (406190986).

Almost surely, 2^812381971 is an apocalyptic number.

812381971 is a deficient number, since it is larger than the sum of its proper divisors (1).

812381971 is an equidigital number, since it uses as much as digits as its factorization.

812381971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 40.

The square root of 812381971 is about 28502.3151866651. The cubic root of 812381971 is about 933.0826029589.

The spelling of 812381971 in words is "eight hundred twelve million, three hundred eighty-one thousand, nine hundred seventy-one".