16591977 has 12 divisors (see below), whose sum is σ = 24204804. Its totient is φ = 10951200.

The previous prime is 16591957. The next prime is 16591999. The reversal of 16591977 is 77919561.

It can be written as a sum of positive squares in 2 ways, for example, as 7080921 + 9511056 = 2661^2 + 3084^2 .

It is not a de Polignac number, because 16591977 - 2⁸ = 16591721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16591907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8218 + ... + 10035.

It is an arithmetic number, because the mean of its divisors is an integer number (2017067).

Almost surely, 2^16591977 is an apocalyptic number.

It is an amenable number.

16591977 is a deficient number, since it is larger than the sum of its proper divisors (7612827).

16591977 is a wasteful number, since it uses less digits than its factorization.

16591977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18360 (or 18357 counting only the distinct ones).

The product of its digits is 119070, while the sum is 45.

The square root of 16591977 is about 4073.3250545470. The cubic root of 16591977 is about 255.0543367484.

The spelling of 16591977 in words is "sixteen million, five hundred ninety-one thousand, nine hundred seventy-seven".