81217322 has 4 divisors (see below), whose sum is σ = 121825986. Its totient is φ = 40608660.

The previous prime is 81217309. The next prime is 81217349. The reversal of 81217322 is 22371218.

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., 77457601 + 3759721 = 8801^2 + 1939^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81217291 and 81217300.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20304329 + ... + 20304332.

Almost surely, 2^81217322 is an apocalyptic number.

81217322 is a deficient number, since it is larger than the sum of its proper divisors (40608664).

81217322 is a wasteful number, since it uses less digits than its factorization.

81217322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40608663.

The product of its digits is 1344, while the sum is 26.

The square root of 81217322 is about 9012.0653570644. The cubic root of 81217322 is about 433.0614793222.

The spelling of 81217322 in words is "eighty-one million, two hundred seventeen thousand, three hundred twenty-two".