16563487 has 2 divisors, whose sum is σ = 16563488. Its totient is φ = 16563486.

The previous prime is 16563479. The next prime is 16563527. The reversal of 16563487 is 78436561.

It is a happy number.

It is an a-pointer prime, because the next prime (16563527) can be obtained adding 16563487 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16563487 - 2³ = 16563479 is a prime.

It is a super-3 number, since 3×16563487³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16563187) 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, 8281743 + 8281744.

It is an arithmetic number, because the mean of its divisors is an integer number (8281744).

Almost surely, 2^16563487 is an apocalyptic number.

16563487 is a deficient number, since it is larger than the sum of its proper divisors (1).

16563487 is an equidigital number, since it uses as much as digits as its factorization.

16563487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 40.

The square root of 16563487 is about 4069.8264090745. The cubic root of 16563487 is about 254.9082689407.

The spelling of 16563487 in words is "sixteen million, five hundred sixty-three thousand, four hundred eighty-seven".