981660457 has 2 divisors, whose sum is σ = 981660458. Its totient is φ = 981660456.

The previous prime is 981660451. The next prime is 981660481. The reversal of 981660457 is 754066189.

981660457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 756030016 + 225630441 = 27496^2 + 15021^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981660457 is a prime.

It is not a weakly prime, because it can be changed into another prime (981660451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490830228 + 490830229.

It is an arithmetic number, because the mean of its divisors is an integer number (490830229).

Almost surely, 2^981660457 is an apocalyptic number.

It is an amenable number.

981660457 is a deficient number, since it is larger than the sum of its proper divisors (1).

981660457 is an equidigital number, since it uses as much as digits as its factorization.

981660457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 981660457 is about 31331.4611373297. The cubic root of 981660457 is about 993.8490625400.

The spelling of 981660457 in words is "nine hundred eighty-one million, six hundred sixty thousand, four hundred fifty-seven".