4809781 has 2 divisors, whose sum is σ = 4809782. Its totient is φ = 4809780.

The previous prime is 4809773. The next prime is 4809787. The reversal of 4809781 is 1879084.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4223025 + 586756 = 2055^2 + 766^2 .

It is a cyclic number.

It is not a de Polignac number, because 4809781 - 2³ = 4809773 is a prime.

It is a super-3 number, since 3×4809781³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 4809781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4809787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2404890 + 2404891.

It is an arithmetic number, because the mean of its divisors is an integer number (2404891).

Almost surely, 2^4809781 is an apocalyptic number.

It is an amenable number.

4809781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4809781 is an equidigital number, since it uses as much as digits as its factorization.

4809781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 4809781 is about 2193.1212916754. The cubic root of 4809781 is about 168.8010333075.

The spelling of 4809781 in words is "four million, eight hundred nine thousand, seven hundred eighty-one".