981698191 has 2 divisors, whose sum is σ = 981698192. Its totient is φ = 981698190.

The previous prime is 981698177. The next prime is 981698231. The reversal of 981698191 is 191896189.

981698191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 981698191 - 2⁷ = 981698063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981698101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490849095 + 490849096.

It is an arithmetic number, because the mean of its divisors is an integer number (490849096).

Almost surely, 2^981698191 is an apocalyptic number.

981698191 is a deficient number, since it is larger than the sum of its proper divisors (1).

981698191 is an equidigital number, since it uses as much as digits as its factorization.

981698191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 52.

The square root of 981698191 is about 31332.0633058214. The cubic root of 981698191 is about 993.8617965492.

The spelling of 981698191 in words is "nine hundred eighty-one million, six hundred ninety-eight thousand, one hundred ninety-one".