16501987 has 2 divisors, whose sum is σ = 16501988. Its totient is φ = 16501986.

The previous prime is 16501943. The next prime is 16501997. The reversal of 16501987 is 78910561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16501987 - 2¹¹ = 16499939 is a prime.

It is not a weakly prime, because it can be changed into another prime (16501907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8250993 + 8250994.

It is an arithmetic number, because the mean of its divisors is an integer number (8250994).

Almost surely, 2^16501987 is an apocalyptic number.

16501987 is a deficient number, since it is larger than the sum of its proper divisors (1).

16501987 is an equidigital number, since it uses as much as digits as its factorization.

16501987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 16501987 is about 4062.2637777476. The cubic root of 16501987 is about 254.5923873610.

The spelling of 16501987 in words is "sixteen million, five hundred one thousand, nine hundred eighty-seven".