16566131 has 2 divisors, whose sum is σ = 16566132. Its totient is φ = 16566130.

The previous prime is 16566101. The next prime is 16566181. The reversal of 16566131 is 13166561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16566131 - 2¹⁴ = 16549747 is a prime.

It is a super-2 number, since 2×16566131² = 548873392618322, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 16566094 and 16566103.

It is not a weakly prime, because it can be changed into another prime (16566101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8283065 + 8283066.

It is an arithmetic number, because the mean of its divisors is an integer number (8283066).

Almost surely, 2^16566131 is an apocalyptic number.

16566131 is a deficient number, since it is larger than the sum of its proper divisors (1).

16566131 is an equidigital number, since it uses as much as digits as its factorization.

16566131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 16566131 is about 4070.1512256917. The cubic root of 16566131 is about 254.9218317371.

The spelling of 16566131 in words is "sixteen million, five hundred sixty-six thousand, one hundred thirty-one".