16271945 has 4 divisors (see below), whose sum is σ = 19526340. Its totient is φ = 13017552.

The previous prime is 16271939. The next prime is 16271953. The reversal of 16271945 is 54917261.

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 3853369 + 12418576 = 1963^2 + 3524^2 .

It is a cyclic number.

It is not a de Polignac number, because 16271945 - 2⁶ = 16271881 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1627190 + ... + 1627199.

It is an arithmetic number, because the mean of its divisors is an integer number (4881585).

Almost surely, 2^16271945 is an apocalyptic number.

It is an amenable number.

16271945 is a deficient number, since it is larger than the sum of its proper divisors (3254395).

16271945 is an equidigital number, since it uses as much as digits as its factorization.

16271945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3254394.

The product of its digits is 15120, while the sum is 35.

The square root of 16271945 is about 4033.8498980502. The cubic root of 16271945 is about 253.4038190678.

The spelling of 16271945 in words is "sixteen million, two hundred seventy-one thousand, nine hundred forty-five".