16538857 has 2 divisors, whose sum is σ = 16538858. Its totient is φ = 16538856.

The previous prime is 16538831. The next prime is 16538861. The reversal of 16538857 is 75883561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9511056 + 7027801 = 3084^2 + 2651^2 .

It is a cyclic number.

It is not a de Polignac number, because 16538857 - 2¹⁵ = 16506089 is a prime.

It is not a weakly prime, because it can be changed into another prime (16538827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8269428 + 8269429.

It is an arithmetic number, because the mean of its divisors is an integer number (8269429).

Almost surely, 2^16538857 is an apocalyptic number.

It is an amenable number.

16538857 is a deficient number, since it is larger than the sum of its proper divisors (1).

16538857 is an equidigital number, since it uses as much as digits as its factorization.

16538857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 43.

The square root of 16538857 is about 4066.7993557588. The cubic root of 16538857 is about 254.7818562428.

The spelling of 16538857 in words is "sixteen million, five hundred thirty-eight thousand, eight hundred fifty-seven".