16256491 has 2 divisors, whose sum is σ = 16256492. Its totient is φ = 16256490.

The previous prime is 16256489. The next prime is 16256497. The reversal of 16256491 is 19465261.

It is a weak prime.

It is an emirp because it is prime and its reverse (19465261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16256491 - 2¹ = 16256489 is a prime.

Together with 16256489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16256497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8128245 + 8128246.

It is an arithmetic number, because the mean of its divisors is an integer number (8128246).

Almost surely, 2^16256491 is an apocalyptic number.

16256491 is a deficient number, since it is larger than the sum of its proper divisors (1).

16256491 is an equidigital number, since it uses as much as digits as its factorization.

16256491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 34.

The square root of 16256491 is about 4031.9339032281. The cubic root of 16256491 is about 253.3235716845.

The spelling of 16256491 in words is "sixteen million, two hundred fifty-six thousand, four hundred ninety-one".