981734861 has 2 divisors, whose sum is σ = 981734862. Its totient is φ = 981734860.

The previous prime is 981734857. The next prime is 981734863. The reversal of 981734861 is 168437189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 703045225 + 278689636 = 26515^2 + 16694^2 .

It is an emirp because it is prime and its reverse (168437189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981734861 - 2² = 981734857 is a prime.

Together with 981734863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981734863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490867430 + 490867431.

It is an arithmetic number, because the mean of its divisors is an integer number (490867431).

Almost surely, 2^981734861 is an apocalyptic number.

It is an amenable number.

981734861 is a deficient number, since it is larger than the sum of its proper divisors (1).

981734861 is an equidigital number, since it uses as much as digits as its factorization.

981734861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 981734861 is about 31332.6484836504. The cubic root of 981734861 is about 993.8741711801.

The spelling of 981734861 in words is "nine hundred eighty-one million, seven hundred thirty-four thousand, eight hundred sixty-one".