16649959 has 2 divisors, whose sum is σ = 16649960. Its totient is φ = 16649958.

The previous prime is 16649957. The next prime is 16649989. The reversal of 16649959 is 95994661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16649959 - 2¹ = 16649957 is a prime.

It is a super-2 number, since 2×16649959² = 554442269403362, which contains 22 as substring.

Together with 16649957, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16649957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8324979 + 8324980.

It is an arithmetic number, because the mean of its divisors is an integer number (8324980).

Almost surely, 2^16649959 is an apocalyptic number.

16649959 is a deficient number, since it is larger than the sum of its proper divisors (1).

16649959 is an equidigital number, since it uses as much as digits as its factorization.

16649959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 49.

The square root of 16649959 is about 4080.4361286510. The cubic root of 16649959 is about 255.3510939766.

The spelling of 16649959 in words is "sixteen million, six hundred forty-nine thousand, nine hundred fifty-nine".