981731671 has 2 divisors, whose sum is σ = 981731672. Its totient is φ = 981731670.

The previous prime is 981731651. The next prime is 981731713. The reversal of 981731671 is 176137189.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 981731671 - 2²¹ = 979634519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981731651) 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 as a sum of consecutive naturals, namely, 490865835 + 490865836.

It is an arithmetic number, because the mean of its divisors is an integer number (490865836).

Almost surely, 2^981731671 is an apocalyptic number.

981731671 is a deficient number, since it is larger than the sum of its proper divisors (1).

981731671 is an equidigital number, since it uses as much as digits as its factorization.

981731671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 43.

The square root of 981731671 is about 31332.5975782411. The cubic root of 981731671 is about 993.8730946973.

The spelling of 981731671 in words is "nine hundred eighty-one million, seven hundred thirty-one thousand, six hundred seventy-one".