981705091 has 8 divisors (see below), whose sum is σ = 1033678800. Its totient is φ = 929761920.

The previous prime is 981705089. The next prime is 981705119. The reversal of 981705091 is 190507189.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 981705091 - 2¹ = 981705089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981702091) 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 in 7 ways as a sum of consecutive naturals, for example, 91455 + ... + 101623.

It is an arithmetic number, because the mean of its divisors is an integer number (129209850).

Almost surely, 2^981705091 is an apocalyptic number.

981705091 is a deficient number, since it is larger than the sum of its proper divisors (51973709).

981705091 is a wasteful number, since it uses less digits than its factorization.

981705091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15269.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 981705091 is about 31332.1734164740. The cubic root of 981705091 is about 993.8641250416.

The spelling of 981705091 in words is "nine hundred eighty-one million, seven hundred five thousand, ninety-one".