981948849109 has 2 divisors, whose sum is σ = 981948849110. Its totient is φ = 981948849108.

The previous prime is 981948849097. The next prime is 981948849113. The reversal of 981948849109 is 901948849189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 518827768209 + 463121080900 = 720297^2 + 680530^2 .

It is a cyclic number.

It is not a de Polignac number, because 981948849109 - 2⁷ = 981948848981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981948849179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490974424554 + 490974424555.

It is an arithmetic number, because the mean of its divisors is an integer number (490974424555).

Almost surely, 2^981948849109 is an apocalyptic number.

It is an amenable number.

981948849109 is a deficient number, since it is larger than the sum of its proper divisors (1).

981948849109 is an equidigital number, since it uses as much as digits as its factorization.

981948849109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53747712, while the sum is 70.

The spelling of 981948849109 in words is "nine hundred eighty-one billion, nine hundred forty-eight million, eight hundred forty-nine thousand, one hundred nine".