98781091 has 2 divisors, whose sum is σ = 98781092. Its totient is φ = 98781090.

The previous prime is 98781077. The next prime is 98781161. The reversal of 98781091 is 19018789.

It is a weak prime.

It is an emirp because it is prime and its reverse (19018789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98781091 - 2⁷ = 98780963 is a prime.

It is not a weakly prime, because it can be changed into another prime (98781031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49390545 + 49390546.

It is an arithmetic number, because the mean of its divisors is an integer number (49390546).

Almost surely, 2^98781091 is an apocalyptic number.

98781091 is a deficient number, since it is larger than the sum of its proper divisors (1).

98781091 is an equidigital number, since it uses as much as digits as its factorization.

98781091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 98781091 is about 9938.8676920462. The cubic root of 98781091 is about 462.2652771465.

The spelling of 98781091 in words is "ninety-eight million, seven hundred eighty-one thousand, ninety-one".