16381081 has 8 divisors (see below), whose sum is σ = 17672904. Its totient is φ = 15125760.

The previous prime is 16381067. The next prime is 16381087. The reversal of 16381081 is 18018361.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10621081 + 5760000 = 3259^2 + 2400^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 16381081 - 2⁹ = 16380569 is a prime.

It is a super-2 number, since 2×16381081² = 536679629457122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16381087) 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, 8190 + ... + 9991.

It is an arithmetic number, because the mean of its divisors is an integer number (2209113).

Almost surely, 2^16381081 is an apocalyptic number.

It is an amenable number.

16381081 is a deficient number, since it is larger than the sum of its proper divisors (1291823).

16381081 is a wasteful number, since it uses less digits than its factorization.

16381081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18251.

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

The square root of 16381081 is about 4047.3548151849. The cubic root of 16381081 is about 253.9690840087.

The spelling of 16381081 in words is "sixteen million, three hundred eighty-one thousand, eighty-one".