34781 has 2 divisors, whose sum is σ = 34782.
Its totient is φ = 34780.
The previous prime is 34763. The next prime is 34807. The reversal of 34781 is 18743.
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 27556 + 7225 = 166^2 + 85^2
It is an emirp because it is prime and its reverse (18743) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 34781 - 210 = 33757 is a prime.
It is a super-2 number, since 2×347812 = 2419435922, which contains 22 as substring.
It is a Chen prime.
It is an alternating number because its digits alternate between odd and even.
It is a nialpdrome in base 14.
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 34781.
It is not a weakly prime, because it can be changed into another prime (34721) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17390 + 17391.
It is an arithmetic number, because the mean of its divisors is an integer number (17391).
234781 is an apocalyptic number.
It is an amenable number.
34781 is a deficient number, since it is larger than the sum of its proper divisors (1).
34781 is an equidigital number, since it uses as much as digits as its factorization.
34781 is an evil number, because the sum of its binary digits is even.
The product of its digits is 672, while the sum is 23.
The square root of 34781 is about 186.4966487635.
The cubic root of 34781 is about 32.6422952098.
Adding to 34781 its product of digits (672), we get a palindrome (35453).
The spelling of 34781 in words is "thirty-four thousand, seven hundred eighty-one".