981464581 has 2 divisors, whose sum is σ = 981464582. Its totient is φ = 981464580.

The previous prime is 981464573. The next prime is 981464593. The reversal of 981464581 is 185464189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 685968481 + 295496100 = 26191^2 + 17190^2 .

It is an emirp because it is prime and its reverse (185464189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981464581 - 2³ = 981464573 is a prime.

It is a super-2 number, since 2×981464581² = 1926545447515011122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981464501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490732290 + 490732291.

It is an arithmetic number, because the mean of its divisors is an integer number (490732291).

Almost surely, 2^981464581 is an apocalyptic number.

It is an amenable number.

981464581 is a deficient number, since it is larger than the sum of its proper divisors (1).

981464581 is an equidigital number, since it uses as much as digits as its factorization.

981464581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 46.

The square root of 981464581 is about 31328.3351137592. The cubic root of 981464581 is about 993.7829554568.

The spelling of 981464581 in words is "nine hundred eighty-one million, four hundred sixty-four thousand, five hundred eighty-one".