81675522 has 12 divisors (see below), whose sum is σ = 176963670. Its totient is φ = 27225168.

The previous prime is 81675521. The next prime is 81675557. The reversal of 81675522 is 22557618.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 46498761 + 35176761 = 6819^2 + 5931^2 .

It is not an unprimeable number, because it can be changed into a prime (81675521) 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 in 5 ways as a sum of consecutive naturals, for example, 2268747 + ... + 2268782.

Almost surely, 2^81675522 is an apocalyptic number.

81675522 is an abundant number, since it is smaller than the sum of its proper divisors (95288148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81675522 is a wasteful number, since it uses less digits than its factorization.

81675522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4537537 (or 4537534 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 81675522 is about 9037.4510787058. The cubic root of 81675522 is about 433.8743468841.

It can be divided in two parts, 8167 and 5522, that added together give a square (13689 = 117²).

The spelling of 81675522 in words is "eighty-one million, six hundred seventy-five thousand, five hundred twenty-two".