18056641 has 4 divisors (see below), whose sum is σ = 18070272. Its totient is φ = 18043012.

The previous prime is 18056617. The next prime is 18056653. The reversal of 18056641 is 14665081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14665081 = 47 ⋅312023.

It is a cyclic number.

It is not a de Polignac number, because 18056641 - 2¹¹ = 18054593 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18056611) 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, 4585 + ... + 7558.

It is an arithmetic number, because the mean of its divisors is an integer number (4517568).

Almost surely, 2^18056641 is an apocalyptic number.

18056641 is the 2688-th centered pentagonal number.

It is an amenable number.

18056641 is a deficient number, since it is larger than the sum of its proper divisors (13631).

18056641 is a wasteful number, since it uses less digits than its factorization.

18056641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13630.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 18056641 is about 4249.3106499761. The cubic root of 18056641 is about 262.3487430943.

The spelling of 18056641 in words is "eighteen million, fifty-six thousand, six hundred forty-one".