82581157 has 2 divisors, whose sum is σ = 82581158. Its totient is φ = 82581156.

The previous prime is 82581127. The next prime is 82581167. The reversal of 82581157 is 75118528.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82283041 + 298116 = 9071^2 + 546^2 .

It is a cyclic number.

It is not a de Polignac number, because 82581157 - 2⁷ = 82581029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82581127) 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, 41290578 + 41290579.

It is an arithmetic number, because the mean of its divisors is an integer number (41290579).

Almost surely, 2^82581157 is an apocalyptic number.

It is an amenable number.

82581157 is a deficient number, since it is larger than the sum of its proper divisors (1).

82581157 is an equidigital number, since it uses as much as digits as its factorization.

82581157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22400, while the sum is 37.

The square root of 82581157 is about 9087.4175099420. The cubic root of 82581157 is about 435.4720853596.

The spelling of 82581157 in words is "eighty-two million, five hundred eighty-one thousand, one hundred fifty-seven".