16871557 has 2 divisors, whose sum is σ = 16871558. Its totient is φ = 16871556.

The previous prime is 16871551. The next prime is 16871573. The reversal of 16871557 is 75517861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16859236 + 12321 = 4106^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 16871557 - 2³ = 16871549 is a prime.

It is a Chen prime.

It is the 4108-th Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16871551) by changing a digit.

It is a nontrivial repunit in base 4107.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8435778 + 8435779.

It is an arithmetic number, because the mean of its divisors is an integer number (8435779).

Almost surely, 2^16871557 is an apocalyptic number.

It is an amenable number.

16871557 is a deficient number, since it is larger than the sum of its proper divisors (1).

16871557 is an equidigital number, since it uses as much as digits as its factorization.

16871557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58800, while the sum is 40.

The square root of 16871557 is about 4107.5000912964. The cubic root of 16871557 is about 256.4789465270.

The spelling of 16871557 in words is "sixteen million, eight hundred seventy-one thousand, five hundred fifty-seven".