81704153 has 2 divisors, whose sum is σ = 81704154. Its totient is φ = 81704152.

The previous prime is 81704149. The next prime is 81704191. The reversal of 81704153 is 35140718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45859984 + 35844169 = 6772^2 + 5987^2 .

It is a cyclic number.

It is not a de Polignac number, because 81704153 - 2² = 81704149 is a prime.

It is not a weakly prime, because it can be changed into another prime (81704113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40852076 + 40852077.

It is an arithmetic number, because the mean of its divisors is an integer number (40852077).

Almost surely, 2^81704153 is an apocalyptic number.

It is an amenable number.

81704153 is a deficient number, since it is larger than the sum of its proper divisors (1).

81704153 is an equidigital number, since it uses as much as digits as its factorization.

81704153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 81704153 is about 9039.0349595518. The cubic root of 81704153 is about 433.9250385515.

The spelling of 81704153 in words is "eighty-one million, seven hundred four thousand, one hundred fifty-three".