981973849 has 2 divisors, whose sum is σ = 981973850. Its totient is φ = 981973848.

The previous prime is 981973841. The next prime is 981973859. The reversal of 981973849 is 948379189.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 660130249 + 321843600 = 25693^2 + 17940^2 .

It is a cyclic number.

It is not a de Polignac number, because 981973849 - 2³ = 981973841 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 981973793 and 981973802.

It is not a weakly prime, because it can be changed into another prime (981973841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490986924 + 490986925.

It is an arithmetic number, because the mean of its divisors is an integer number (490986925).

Almost surely, 2^981973849 is an apocalyptic number.

It is an amenable number.

981973849 is a deficient number, since it is larger than the sum of its proper divisors (1).

981973849 is an equidigital number, since it uses as much as digits as its factorization.

981973849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 58.

The square root of 981973849 is about 31336.4619732349. The cubic root of 981973849 is about 993.9548123453.

The spelling of 981973849 in words is "nine hundred eighty-one million, nine hundred seventy-three thousand, eight hundred forty-nine".