8220181 has 8 divisors (see below), whose sum is σ = 8474400. Its totient is φ = 7968912.

The previous prime is 8220169. The next prime is 8220193. The reversal of 8220181 is 1810228.

It is an interprime number because it is at equal distance from previous prime (8220169) and next prime (8220193).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8220181 is a prime.

It is a super-2 number, since 2×8220181² = 135142751345522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8220101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5766 + ... + 7048.

It is an arithmetic number, because the mean of its divisors is an integer number (1059300).

Almost surely, 2^8220181 is an apocalyptic number.

It is an amenable number.

8220181 is a deficient number, since it is larger than the sum of its proper divisors (254219).

8220181 is a wasteful number, since it uses less digits than its factorization.

8220181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 8220181 is about 2867.0858026923. The cubic root of 8220181 is about 201.8182612034.

The spelling of 8220181 in words is "eight million, two hundred twenty thousand, one hundred eighty-one".