16147391 has 4 divisors (see below), whose sum is σ = 17389512. Its totient is φ = 14905272.

The previous prime is 16147349. The next prime is 16147393. The reversal of 16147391 is 19374161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19374161 = 2053 ⋅9437.

It is a cyclic number.

It is not a de Polignac number, because 16147391 - 2¹⁰ = 16146367 is a prime.

It is a super-2 number, since 2×16147391² = 521476472213762, 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 (16147393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621041 + ... + 621066.

It is an arithmetic number, because the mean of its divisors is an integer number (4347378).

Almost surely, 2^16147391 is an apocalyptic number.

16147391 is a deficient number, since it is larger than the sum of its proper divisors (1242121).

16147391 is a wasteful number, since it uses less digits than its factorization.

16147391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242120.

The product of its digits is 4536, while the sum is 32.

The square root of 16147391 is about 4018.3816394165. The cubic root of 16147391 is about 252.7556004033.

The spelling of 16147391 in words is "sixteen million, one hundred forty-seven thousand, three hundred ninety-one".