81295573 has 2 divisors, whose sum is σ = 81295574. Its totient is φ = 81295572.

The previous prime is 81295567. The next prime is 81295597. The reversal of 81295573 is 37559218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51940849 + 29354724 = 7207^2 + 5418^2 .

It is a cyclic number.

It is not a de Polignac number, because 81295573 - 2⁵ = 81295541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81295553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40647786 + 40647787.

It is an arithmetic number, because the mean of its divisors is an integer number (40647787).

Almost surely, 2^81295573 is an apocalyptic number.

It is an amenable number.

81295573 is a deficient number, since it is larger than the sum of its proper divisors (1).

81295573 is an equidigital number, since it uses as much as digits as its factorization.

81295573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 40.

The square root of 81295573 is about 9016.4057694849. The cubic root of 81295573 is about 433.2005162318.

The spelling of 81295573 in words is "eighty-one million, two hundred ninety-five thousand, five hundred seventy-three".