16605971 has 2 divisors, whose sum is σ = 16605972. Its totient is φ = 16605970.

The previous prime is 16605947. The next prime is 16605973. The reversal of 16605971 is 17950661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16605971 - 2¹⁰ = 16604947 is a prime.

Together with 16605973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16605973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8302985 + 8302986.

It is an arithmetic number, because the mean of its divisors is an integer number (8302986).

Almost surely, 2^16605971 is an apocalyptic number.

16605971 is a deficient number, since it is larger than the sum of its proper divisors (1).

16605971 is an equidigital number, since it uses as much as digits as its factorization.

16605971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 16605971 is about 4075.0424537666. The cubic root of 16605971 is about 255.1260225478.

It can be divided in two parts, 16605 and 971, that added together give a cube (17576 = 26³).

The spelling of 16605971 in words is "sixteen million, six hundred five thousand, nine hundred seventy-one".