16491311 has 2 divisors, whose sum is σ = 16491312. Its totient is φ = 16491310.

The previous prime is 16491301. The next prime is 16491337. The reversal of 16491311 is 11319461.

It is an a-pointer prime, because the next prime (16491337) can be obtained adding 16491311 to its sum of digits (26).

It is a weak prime.

It is an emirp because it is prime and its reverse (11319461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16491311 is a prime.

It is a super-3 number, since 3×16491311³ (a number of 23 digits) contains 333 as substring.

It is equal to p_1060667 and since 16491311 and 1060667 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16491301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8245655 + 8245656.

It is an arithmetic number, because the mean of its divisors is an integer number (8245656).

Almost surely, 2^16491311 is an apocalyptic number.

16491311 is a deficient number, since it is larger than the sum of its proper divisors (1).

16491311 is an equidigital number, since it uses as much as digits as its factorization.

16491311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 16491311 is about 4060.9495195090. The cubic root of 16491311 is about 254.5374724654.

The spelling of 16491311 in words is "sixteen million, four hundred ninety-one thousand, three hundred eleven".