8181722 has 4 divisors (see below), whose sum is σ = 12272586. Its totient is φ = 4090860.

The previous prime is 8181697. The next prime is 8181727. The reversal of 8181722 is 2271818.

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., 8059921 + 121801 = 2839^2 + 349^2 .

It is not an unprimeable number, because it can be changed into a prime (8181727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2045429 + ... + 2045432.

Almost surely, 2^8181722 is an apocalyptic number.

8181722 is a deficient number, since it is larger than the sum of its proper divisors (4090864).

8181722 is a wasteful number, since it uses less digits than its factorization.

8181722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4090863.

The product of its digits is 1792, while the sum is 29.

The square root of 8181722 is about 2860.3709549637. The cubic root of 8181722 is about 201.5030262647.

The spelling of 8181722 in words is "eight million, one hundred eighty-one thousand, seven hundred twenty-two".