16109657 has 4 divisors (see below), whose sum is σ = 16151460. Its totient is φ = 16067856.

The previous prime is 16109651. The next prime is 16109669. The reversal of 16109657 is 75690161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75690161 = 193 ⋅392177.

It can be written as a sum of positive squares in 2 ways, for example, as 8386816 + 7722841 = 2896^2 + 2779^2 .

It is a cyclic number.

It is not a de Polignac number, because 16109657 - 2⁴ = 16109641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16109651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20318 + ... + 21095.

It is an arithmetic number, because the mean of its divisors is an integer number (4037865).

Almost surely, 2^16109657 is an apocalyptic number.

It is an amenable number.

16109657 is a deficient number, since it is larger than the sum of its proper divisors (41803).

16109657 is an equidigital number, since it uses as much as digits as its factorization.

16109657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41802.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 16109657 is about 4013.6837194777. The cubic root of 16109657 is about 252.5585630264.

The spelling of 16109657 in words is "sixteen million, one hundred nine thousand, six hundred fifty-seven".