16604491 has 2 divisors, whose sum is σ = 16604492. Its totient is φ = 16604490.

The previous prime is 16604479. The next prime is 16604503. The reversal of 16604491 is 19440661.

It is a balanced prime because it is at equal distance from previous prime (16604479) and next prime (16604503).

It is an emirp because it is prime and its reverse (19440661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16604491 is a prime.

It is not a weakly prime, because it can be changed into another prime (16604431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8302245 + 8302246.

It is an arithmetic number, because the mean of its divisors is an integer number (8302246).

Almost surely, 2^16604491 is an apocalyptic number.

16604491 is a deficient number, since it is larger than the sum of its proper divisors (1).

16604491 is an equidigital number, since it uses as much as digits as its factorization.

16604491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 16604491 is about 4074.8608565201. The cubic root of 16604491 is about 255.1184429904.

The spelling of 16604491 in words is "sixteen million, six hundred four thousand, four hundred ninety-one".