81842153 has 2 divisors, whose sum is σ = 81842154. Its totient is φ = 81842152.

The previous prime is 81842149. The next prime is 81842179. The reversal of 81842153 is 35124818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57714409 + 24127744 = 7597^2 + 4912^2 .

It is a cyclic number.

It is not a de Polignac number, because 81842153 - 2² = 81842149 is a prime.

It is not a weakly prime, because it can be changed into another prime (81842953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40921076 + 40921077.

It is an arithmetic number, because the mean of its divisors is an integer number (40921077).

Almost surely, 2^81842153 is an apocalyptic number.

It is an amenable number.

81842153 is a deficient number, since it is larger than the sum of its proper divisors (1).

81842153 is an equidigital number, since it uses as much as digits as its factorization.

81842153 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 81842153 is about 9046.6652972242. The cubic root of 81842153 is about 434.1692039169.

The spelling of 81842153 in words is "eighty-one million, eight hundred forty-two thousand, one hundred fifty-three".