16634491 has 2 divisors, whose sum is σ = 16634492. Its totient is φ = 16634490.

The previous prime is 16634467. The next prime is 16634531. The reversal of 16634491 is 19443661.

It is a weak prime.

It is an emirp because it is prime and its reverse (19443661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16634491 - 2²³ = 8245883 is a prime.

It is not a weakly prime, because it can be changed into another prime (16634411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8317245 + 8317246.

It is an arithmetic number, because the mean of its divisors is an integer number (8317246).

Almost surely, 2^16634491 is an apocalyptic number.

16634491 is a deficient number, since it is larger than the sum of its proper divisors (1).

16634491 is an equidigital number, since it uses as much as digits as its factorization.

16634491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 16634491 is about 4078.5403026083. The cubic root of 16634491 is about 255.2719947932.

The spelling of 16634491 in words is "sixteen million, six hundred thirty-four thousand, four hundred ninety-one".