81234851 has 2 divisors, whose sum is σ = 81234852. Its totient is φ = 81234850.

The previous prime is 81234833. The next prime is 81234871. The reversal of 81234851 is 15843218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81234851 - 2¹⁰ = 81233827 is a prime.

It is not a weakly prime, because it can be changed into another prime (81234821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40617425 + 40617426.

It is an arithmetic number, because the mean of its divisors is an integer number (40617426).

Almost surely, 2^81234851 is an apocalyptic number.

81234851 is a deficient number, since it is larger than the sum of its proper divisors (1).

81234851 is an equidigital number, since it uses as much as digits as its factorization.

81234851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 32.

The square root of 81234851 is about 9013.0378341600. The cubic root of 81234851 is about 433.0926327282.

The spelling of 81234851 in words is "eighty-one million, two hundred thirty-four thousand, eight hundred fifty-one".