18217061 has 8 divisors (see below), whose sum is σ = 18885240. Its totient is φ = 17558208.

The previous prime is 18217051. The next prime is 18217063. The reversal of 18217061 is 16071281.

It can be written as a sum of positive squares in 4 ways, for example, as 2265025 + 15952036 = 1505^2 + 3994^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18217061 - 2¹⁸ = 17954917 is a prime.

It is a super-2 number, since 2×18217061² = 663722622955442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18217061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18217063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1775 + ... + 6291.

It is an arithmetic number, because the mean of its divisors is an integer number (2360655).

Almost surely, 2^18217061 is an apocalyptic number.

It is an amenable number.

18217061 is a deficient number, since it is larger than the sum of its proper divisors (668179).

18217061 is a wasteful number, since it uses less digits than its factorization.

18217061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4663.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 18217061 is about 4268.1449131912. The cubic root of 18217061 is about 263.1233789110.

The spelling of 18217061 in words is "eighteen million, two hundred seventeen thousand, sixty-one".