989870087 has 2 divisors, whose sum is σ = 989870088. Its totient is φ = 989870086.

The previous prime is 989870069. The next prime is 989870117. The reversal of 989870087 is 780078989.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 989870087 - 2⁶ = 989870023 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989870887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494935043 + 494935044.

It is an arithmetic number, because the mean of its divisors is an integer number (494935044).

Almost surely, 2^989870087 is an apocalyptic number.

989870087 is a deficient number, since it is larger than the sum of its proper divisors (1).

989870087 is an equidigital number, since it uses as much as digits as its factorization.

989870087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 56.

The square root of 989870087 is about 31462.2009242837. The cubic root of 989870087 is about 996.6118960492.

The spelling of 989870087 in words is "nine hundred eighty-nine million, eight hundred seventy thousand, eighty-seven".