18161941 has 8 divisors (see below), whose sum is σ = 20820800. Its totient is φ = 15519168.

The previous prime is 18161903. The next prime is 18161947. The reversal of 18161941 is 14916181.

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

It is not a de Polignac number, because 18161941 - 2¹⁷ = 18030869 is a prime.

It is a super-2 number, since 2×18161941² = 659712201774962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18161947) 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, 1491 + ... + 6208.

It is an arithmetic number, because the mean of its divisors is an integer number (2602600).

Almost surely, 2^18161941 is an apocalyptic number.

It is an amenable number.

18161941 is a deficient number, since it is larger than the sum of its proper divisors (2658859).

18161941 is an equidigital number, since it uses as much as digits as its factorization.

18161941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8043.

The product of its digits is 1728, while the sum is 31.

The square root of 18161941 is about 4261.6828835567. The cubic root of 18161941 is about 262.8577302596.

The spelling of 18161941 in words is "eighteen million, one hundred sixty-one thousand, nine hundred forty-one".