4689781 has 2 divisors, whose sum is σ = 4689782. Its totient is φ = 4689780.

The previous prime is 4689779. The next prime is 4689803. The reversal of 4689781 is 1879864.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4536900 + 152881 = 2130^2 + 391^2 .

It is a cyclic number.

It is not a de Polignac number, because 4689781 - 2¹ = 4689779 is a prime.

It is a super-2 number, since 2×4689781² = 43988091655922, which contains 22 as substring.

Together with 4689779, it forms a pair of twin primes.

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 (4689731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2344890 + 2344891.

It is an arithmetic number, because the mean of its divisors is an integer number (2344891).

Almost surely, 2^4689781 is an apocalyptic number.

It is an amenable number.

4689781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4689781 is an equidigital number, since it uses as much as digits as its factorization.

4689781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 4689781 is about 2165.5902197784. The cubic root of 4689781 is about 167.3853793684.

The spelling of 4689781 in words is "four million, six hundred eighty-nine thousand, seven hundred eighty-one".