16509487 has 2 divisors, whose sum is σ = 16509488. Its totient is φ = 16509486.

The previous prime is 16509481. The next prime is 16509491. The reversal of 16509487 is 78490561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16509487 - 2¹⁹ = 15985199 is a prime.

It is a super-2 number, since 2×16509487² = 545126322006338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16509481) 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, 8254743 + 8254744.

It is an arithmetic number, because the mean of its divisors is an integer number (8254744).

Almost surely, 2^16509487 is an apocalyptic number.

16509487 is a deficient number, since it is larger than the sum of its proper divisors (1).

16509487 is an equidigital number, since it uses as much as digits as its factorization.

16509487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 16509487 is about 4063.1868034832. The cubic root of 16509487 is about 254.6309514787.

The spelling of 16509487 in words is "sixteen million, five hundred nine thousand, four hundred eighty-seven".