1998647087 has 2 divisors, whose sum is σ = 1998647088. Its totient is φ = 1998647086.

The previous prime is 1998647083. The next prime is 1998647113. The reversal of 1998647087 is 7807468991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1998647087 - 2² = 1998647083 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998647081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999323543 + 999323544.

It is an arithmetic number, because the mean of its divisors is an integer number (999323544).

Almost surely, 2^1998647087 is an apocalyptic number.

1998647087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998647087 is an equidigital number, since it uses as much as digits as its factorization.

1998647087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6096384, while the sum is 59.

The square root of 1998647087 is about 44706.2309639272. The cubic root of 1998647087 is about 1259.6368918838.

The spelling of 1998647087 in words is "one billion, nine hundred ninety-eight million, six hundred forty-seven thousand, eighty-seven".