16507489 has 2 divisors, whose sum is σ = 16507490. Its totient is φ = 16507488.

The previous prime is 16507457. The next prime is 16507507. The reversal of 16507489 is 98470561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15880225 + 627264 = 3985^2 + 792^2 .

It is a cyclic number.

It is not a de Polignac number, because 16507489 - 2⁵ = 16507457 is a prime.

It is not a weakly prime, because it can be changed into another prime (16507189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8253744 + 8253745.

It is an arithmetic number, because the mean of its divisors is an integer number (8253745).

Almost surely, 2^16507489 is an apocalyptic number.

It is an amenable number.

16507489 is a deficient number, since it is larger than the sum of its proper divisors (1).

16507489 is an equidigital number, since it uses as much as digits as its factorization.

16507489 is an evil number, because the sum of its binary digits is even.

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

The square root of 16507489 is about 4062.9409299176. The cubic root of 16507489 is about 254.6206791392.

The spelling of 16507489 in words is "sixteen million, five hundred seven thousand, four hundred eighty-nine".