81010453 has 2 divisors, whose sum is σ = 81010454. Its totient is φ = 81010452.

The previous prime is 81010441. The next prime is 81010459. The reversal of 81010453 is 35401018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78110244 + 2900209 = 8838^2 + 1703^2 .

It is a cyclic number.

It is not a de Polignac number, because 81010453 - 2¹³ = 81002261 is a prime.

It is equal to p_4725013 and since 81010453 and 4725013 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81010459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40505226 + 40505227.

It is an arithmetic number, because the mean of its divisors is an integer number (40505227).

Almost surely, 2^81010453 is an apocalyptic number.

It is an amenable number.

81010453 is a deficient number, since it is larger than the sum of its proper divisors (1).

81010453 is an equidigital number, since it uses as much as digits as its factorization.

81010453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 81010453 is about 9000.5807034880. The cubic root of 81010453 is about 432.6934824333.

The spelling of 81010453 in words is "eighty-one million, ten thousand, four hundred fifty-three".