81725353 has 2 divisors, whose sum is σ = 81725354. Its totient is φ = 81725352.

The previous prime is 81725351. The next prime is 81725359. The reversal of 81725353 is 35352718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57881664 + 23843689 = 7608^2 + 4883^2 .

It is a cyclic number.

It is not a de Polignac number, because 81725353 - 2¹ = 81725351 is a prime.

Together with 81725351, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (81725351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40862676 + 40862677.

It is an arithmetic number, because the mean of its divisors is an integer number (40862677).

Almost surely, 2^81725353 is an apocalyptic number.

It is an amenable number.

81725353 is a deficient number, since it is larger than the sum of its proper divisors (1).

81725353 is an equidigital number, since it uses as much as digits as its factorization.

81725353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 81725353 is about 9040.2075750505. The cubic root of 81725353 is about 433.9625658780.

The spelling of 81725353 in words is "eighty-one million, seven hundred twenty-five thousand, three hundred fifty-three".