81522349 has 2 divisors, whose sum is σ = 81522350. Its totient is φ = 81522348.

The previous prime is 81522323. The next prime is 81522379. The reversal of 81522349 is 94322518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81324324 + 198025 = 9018^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 81522349 - 2¹¹ = 81520301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81522379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40761174 + 40761175.

It is an arithmetic number, because the mean of its divisors is an integer number (40761175).

Almost surely, 2^81522349 is an apocalyptic number.

It is an amenable number.

81522349 is a deficient number, since it is larger than the sum of its proper divisors (1).

81522349 is an equidigital number, since it uses as much as digits as its factorization.

81522349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 34.

The square root of 81522349 is about 9028.9727544168. The cubic root of 81522349 is about 433.6029500946.

It can be divided in two parts, 8152 and 2349, that added together give a palindrome (10501).

The spelling of 81522349 in words is "eighty-one million, five hundred twenty-two thousand, three hundred forty-nine".