798781 has 2 divisors, whose sum is σ = 798782. Its totient is φ = 798780.

The previous prime is 798773. The next prime is 798799. The reversal of 798781 is 187897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 793881 + 4900 = 891^2 + 70^2 .

It is an emirp because it is prime and its reverse (187897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 798781 - 2³ = 798773 is a prime.

It is a super-2 number, since 2×798781² = 1276102171922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (798701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 399390 + 399391.

It is an arithmetic number, because the mean of its divisors is an integer number (399391).

2⁷⁹⁸⁷⁸¹ is an apocalyptic number.

It is an amenable number.

798781 is a deficient number, since it is larger than the sum of its proper divisors (1).

798781 is an equidigital number, since it uses as much as digits as its factorization.

798781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 40.

The square root of 798781 is about 893.7454894991. The cubic root of 798781 is about 92.7846018967.

The spelling of 798781 in words is "seven hundred ninety-eight thousand, seven hundred eighty-one".