16381018 has 4 divisors (see below), whose sum is σ = 24571530. Its totient is φ = 8190508.

The previous prime is 16381007. The next prime is 16381033. The reversal of 16381018 is 81018361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81018361 = 6529 ⋅12409.

It can be written as a sum of positive squares in only one way, i.e., 16378209 + 2809 = 4047^2 + 53^2 .

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4095253 + ... + 4095256.

Almost surely, 2^16381018 is an apocalyptic number.

16381018 is a deficient number, since it is larger than the sum of its proper divisors (8190512).

16381018 is an equidigital number, since it uses as much as digits as its factorization.

16381018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8190511.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 16381018 is about 4047.3470323164. The cubic root of 16381018 is about 253.9687584284.

Adding to 16381018 its reverse (81018361), we get a palindrome (97399379).

The spelling of 16381018 in words is "sixteen million, three hundred eighty-one thousand, eighteen".