18451641 has 32 divisors (see below), whose sum is σ = 28685440. Its totient is φ = 10450944.

The previous prime is 18451639. The next prime is 18451649. The reversal of 18451641 is 14615481.

It is not a de Polignac number, because 18451641 - 2¹ = 18451639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18451599 and 18451608.

It is not an unprimeable number, because it can be changed into a prime (18451649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27081 + ... + 27753.

It is an arithmetic number, because the mean of its divisors is an integer number (896420).

Almost surely, 2^18451641 is an apocalyptic number.

It is an amenable number.

18451641 is a deficient number, since it is larger than the sum of its proper divisors (10233799).

18451641 is a wasteful number, since it uses less digits than its factorization.

18451641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745.

The product of its digits is 3840, while the sum is 30.

The square root of 18451641 is about 4295.5373354215. The cubic root of 18451641 is about 264.2479735039.

Adding to 18451641 its product of digits (3840), we get a palindrome (18455481).

It can be divided in two parts, 1845 and 1641, that added together give a triangular number (3486 = T₈₃).

The spelling of 18451641 in words is "eighteen million, four hundred fifty-one thousand, six hundred forty-one".