16539697 has 4 divisors (see below), whose sum is σ = 16686180. Its totient is φ = 16393216.

The previous prime is 16539689. The next prime is 16539701. The reversal of 16539697 is 79693561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79693561 = 7643 ⋅10427.

It can be written as a sum of positive squares in 2 ways, for example, as 929296 + 15610401 = 964^2 + 3951^2 .

It is a cyclic number.

It is not a de Polignac number, because 16539697 - 2³ = 16539689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16539617) by changing a digit.

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, 73072 + ... + 73297.

It is an arithmetic number, because the mean of its divisors is an integer number (4171545).

Almost surely, 2^16539697 is an apocalyptic number.

It is an amenable number.

16539697 is a deficient number, since it is larger than the sum of its proper divisors (146483).

16539697 is a wasteful number, since it uses less digits than its factorization.

16539697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146482.

The product of its digits is 306180, while the sum is 46.

The square root of 16539697 is about 4066.9026297663. The cubic root of 16539697 is about 254.7861695827.

The spelling of 16539697 in words is "sixteen million, five hundred thirty-nine thousand, six hundred ninety-seven".