81274573 has 2 divisors, whose sum is σ = 81274574. Its totient is φ = 81274572.

The previous prime is 81274561. The next prime is 81274597. The reversal of 81274573 is 37547218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54213769 + 27060804 = 7363^2 + 5202^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81274573 is a prime.

It is equal to p_4739617 and since 81274573 and 4739617 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 (81274373) 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, 40637286 + 40637287.

It is an arithmetic number, because the mean of its divisors is an integer number (40637287).

Almost surely, 2^81274573 is an apocalyptic number.

It is an amenable number.

81274573 is a deficient number, since it is larger than the sum of its proper divisors (1).

81274573 is an equidigital number, since it uses as much as digits as its factorization.

81274573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 37.

The square root of 81274573 is about 9015.2411504075. The cubic root of 81274573 is about 433.1632120510.

The spelling of 81274573 in words is "eighty-one million, two hundred seventy-four thousand, five hundred seventy-three".