98859991 has 2 divisors, whose sum is σ = 98859992. Its totient is φ = 98859990.

The previous prime is 98859973. The next prime is 98860001. The reversal of 98859991 is 19995889.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (19995889) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98859991 - 2⁷ = 98859863 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 (98859931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49429995 + 49429996.

It is an arithmetic number, because the mean of its divisors is an integer number (49429996).

Almost surely, 2^98859991 is an apocalyptic number.

98859991 is a deficient number, since it is larger than the sum of its proper divisors (1).

98859991 is an equidigital number, since it uses as much as digits as its factorization.

98859991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2099520, while the sum is 58.

The square root of 98859991 is about 9942.8361647972. The cubic root of 98859991 is about 462.3883203444.

The spelling of 98859991 in words is "ninety-eight million, eight hundred fifty-nine thousand, nine hundred ninety-one".