98115991 has 2 divisors, whose sum is σ = 98115992. Its totient is φ = 98115990.

The previous prime is 98115977. The next prime is 98116037. The reversal of 98115991 is 19951189.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 98115991 - 2⁷ = 98115863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98115491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49057995 + 49057996.

It is an arithmetic number, because the mean of its divisors is an integer number (49057996).

Almost surely, 2^98115991 is an apocalyptic number.

98115991 is a deficient number, since it is larger than the sum of its proper divisors (1).

98115991 is an equidigital number, since it uses as much as digits as its factorization.

98115991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 43.

The square root of 98115991 is about 9905.3516343439. The cubic root of 98115991 is about 461.2254517479.

The spelling of 98115991 in words is "ninety-eight million, one hundred fifteen thousand, nine hundred ninety-one".