98637991 has 2 divisors, whose sum is σ = 98637992. Its totient is φ = 98637990.

The previous prime is 98637989. The next prime is 98638009. The reversal of 98637991 is 19973689.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 98637991 - 2¹ = 98637989 is a prime.

Together with 98637989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98637971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49318995 + 49318996.

It is an arithmetic number, because the mean of its divisors is an integer number (49318996).

Almost surely, 2^98637991 is an apocalyptic number.

98637991 is a deficient number, since it is larger than the sum of its proper divisors (1).

98637991 is an equidigital number, since it uses as much as digits as its factorization.

98637991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 52.

The square root of 98637991 is about 9931.6660737260. Note that the first 3 decimals coincide. The cubic root of 98637991 is about 462.0419478662.

The spelling of 98637991 in words is "ninety-eight million, six hundred thirty-seven thousand, nine hundred ninety-one".