973681 has 2 divisors, whose sum is σ = 973682. Its totient is φ = 973680.

The previous prime is 973669. The next prime is 973691. The reversal of 973681 is 186379.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 893025 + 80656 = 945^2 + 284^2 .

It is an emirp because it is prime and its reverse (186379) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 973681 - 2⁹ = 973169 is a prime.

It is a super-2 number, since 2×973681² = 1896109379522, which contains 22 as substring.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (973631) 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, 486840 + 486841.

It is an arithmetic number, because the mean of its divisors is an integer number (486841).

2⁹⁷³⁶⁸¹ is an apocalyptic number.

It is an amenable number.

973681 is a deficient number, since it is larger than the sum of its proper divisors (1).

973681 is an equidigital number, since it uses as much as digits as its factorization.

973681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 34.

The square root of 973681 is about 986.7527552533. The cubic root of 973681 is about 99.1148888972.

The spelling of 973681 in words is "nine hundred seventy-three thousand, six hundred eighty-one".