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996781 is a prime number
BaseRepresentation
bin11110011010110101101
31212122022211
43303112231
5223344111
633210421
711321032
oct3632655
91778284
10996781
11620995
12400a11
1328b916
141bd389
1514a521
hexf35ad

996781 has 2 divisors, whose sum is σ = 996782. Its totient is φ = 996780.

The previous prime is 996763. The next prime is 996803. The reversal of 996781 is 187699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 562500 + 434281 = 750^2 + 659^2 .

It is an emirp because it is prime and its reverse (187699) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-996781 is a prime.

It is a super-2 number, since 2×9967812 = 1987144723922, which contains 22 as substring.

It is a zygodrome in base 5.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (996881) 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, 498390 + 498391.

It is an arithmetic number, because the mean of its divisors is an integer number (498391).

2996781 is an apocalyptic number.

It is an amenable number.

996781 is a deficient number, since it is larger than the sum of its proper divisors (1).

996781 is an equidigital number, since it uses as much as digits as its factorization.

996781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 40.

The square root of 996781 is about 998.3892026660. The cubic root of 996781 is about 99.8925846608.

The spelling of 996781 in words is "nine hundred ninety-six thousand, seven hundred eighty-one".