82131457 has 2 divisors, whose sum is σ = 82131458. Its totient is φ = 82131456.

The previous prime is 82131443. The next prime is 82131461. The reversal of 82131457 is 75413128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79584241 + 2547216 = 8921^2 + 1596^2 .

It is a cyclic number.

It is not a de Polignac number, because 82131457 - 2¹¹ = 82129409 is a prime.

It is not a weakly prime, because it can be changed into another prime (82131407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41065728 + 41065729.

It is an arithmetic number, because the mean of its divisors is an integer number (41065729).

Almost surely, 2^82131457 is an apocalyptic number.

It is an amenable number.

82131457 is a deficient number, since it is larger than the sum of its proper divisors (1).

82131457 is an equidigital number, since it uses as much as digits as its factorization.

82131457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 82131457 is about 9062.6407299418. The cubic root of 82131457 is about 434.6801841802.

The spelling of 82131457 in words is "eighty-two million, one hundred thirty-one thousand, four hundred fifty-seven".