973781 has 2 divisors, whose sum is σ = 973782. Its totient is φ = 973780.

The previous prime is 973759. The next prime is 973787. The reversal of 973781 is 187379.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 625681 + 348100 = 791^2 + 590^2 .

It is an emirp because it is prime and its reverse (187379) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-973781 is a prime.

It is a super-2 number, since 2×973781² = 1896498871922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 973781.

It is not a weakly prime, because it can be changed into another prime (973787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 486890 + 486891.

It is an arithmetic number, because the mean of its divisors is an integer number (486891).

2⁹⁷³⁷⁸¹ is an apocalyptic number.

It is an amenable number.

973781 is a deficient number, since it is larger than the sum of its proper divisors (1).

973781 is an equidigital number, since it uses as much as digits as its factorization.

973781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 35.

The square root of 973781 is about 986.8034252069. The cubic root of 973781 is about 99.1182819146.

It can be divided in two parts, 97378 and 1, that added together give a palindrome (97379).

The spelling of 973781 in words is "nine hundred seventy-three thousand, seven hundred eighty-one".