98999987 has 2 divisors, whose sum is σ = 98999988. Its totient is φ = 98999986.

The previous prime is 98999983. The next prime is 99000007. The reversal of 98999987 is 78999989.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 98999987 - 2² = 98999983 is a prime.

It is not a weakly prime, because it can be changed into another prime (98999983) 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, 49499993 + 49499994.

It is an arithmetic number, because the mean of its divisors is an integer number (49499994).

Almost surely, 2^98999987 is an apocalyptic number.

98999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

98999987 is an equidigital number, since it uses as much as digits as its factorization.

98999987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26453952, while the sum is 68.

The square root of 98999987 is about 9949.8737177916. The cubic root of 98999987 is about 462.6064806695.

The spelling of 98999987 in words is "ninety-eight million, nine hundred ninety-nine thousand, nine hundred eighty-seven".