81243179 has 2 divisors, whose sum is σ = 81243180. Its totient is φ = 81243178.

The previous prime is 81243167. The next prime is 81243191. The reversal of 81243179 is 97134218.

It is a balanced prime because it is at equal distance from previous prime (81243167) and next prime (81243191).

It is a cyclic number.

It is not a de Polignac number, because 81243179 - 2⁴ = 81243163 is a prime.

It is not a weakly prime, because it can be changed into another prime (81243079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40621589 + 40621590.

It is an arithmetic number, because the mean of its divisors is an integer number (40621590).

Almost surely, 2^81243179 is an apocalyptic number.

81243179 is a deficient number, since it is larger than the sum of its proper divisors (1).

81243179 is an equidigital number, since it uses as much as digits as its factorization.

81243179 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 81243179 is about 9013.4998197149. The cubic root of 81243179 is about 433.1074320914.

The spelling of 81243179 in words is "eighty-one million, two hundred forty-three thousand, one hundred seventy-nine".