81180322 has 4 divisors (see below), whose sum is σ = 121770486. Its totient is φ = 40590160.

The previous prime is 81180313. The next prime is 81180329. The reversal of 81180322 is 22308118.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 64947481 + 16232841 = 8059^2 + 4029^2 .

It is not an unprimeable number, because it can be changed into a prime (81180329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20295079 + ... + 20295082.

Almost surely, 2^81180322 is an apocalyptic number.

81180322 is a deficient number, since it is larger than the sum of its proper divisors (40590164).

81180322 is a wasteful number, since it uses less digits than its factorization.

81180322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40590163.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 81180322 is about 9010.0123196364. The cubic root of 81180322 is about 432.9957063722.

The spelling of 81180322 in words is "eighty-one million, one hundred eighty thousand, three hundred twenty-two".