16147381 has 4 divisors (see below), whose sum is σ = 16368652. Its totient is φ = 15926112.

The previous prime is 16147349. The next prime is 16147393. The reversal of 16147381 is 18374161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3006756 + 13140625 = 1734^2 + 3625^2 .

It is a cyclic number.

It is not a de Polignac number, because 16147381 - 2⁵ = 16147349 is a prime.

It is a super-2 number, since 2×16147381² = 521475826318322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16247381) 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, 110526 + ... + 110671.

It is an arithmetic number, because the mean of its divisors is an integer number (4092163).

Almost surely, 2^16147381 is an apocalyptic number.

It is an amenable number.

16147381 is a deficient number, since it is larger than the sum of its proper divisors (221271).

16147381 is an equidigital number, since it uses as much as digits as its factorization.

16147381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221270.

The product of its digits is 4032, while the sum is 31.

The square root of 16147381 is about 4018.3803951343. The cubic root of 16147381 is about 252.7555482265.

The spelling of 16147381 in words is "sixteen million, one hundred forty-seven thousand, three hundred eighty-one".