18209141 has 4 divisors (see below), whose sum is σ = 18331500. Its totient is φ = 18086784.

The previous prime is 18209137. The next prime is 18209161. The reversal of 18209141 is 14190281.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1110916 + 17098225 = 1054^2 + 4135^2 .

It is a cyclic number.

It is not a de Polignac number, because 18209141 - 2² = 18209137 is a prime.

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 18209141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18209101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60956 + ... + 61253.

It is an arithmetic number, because the mean of its divisors is an integer number (4582875).

Almost surely, 2^18209141 is an apocalyptic number.

It is an amenable number.

18209141 is a deficient number, since it is larger than the sum of its proper divisors (122359).

18209141 is a wasteful number, since it uses less digits than its factorization.

18209141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122358.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 18209141 is about 4267.2170087775. The cubic root of 18209141 is about 263.0852417816.

The spelling of 18209141 in words is "eighteen million, two hundred nine thousand, one hundred forty-one".