4917781 has 16 divisors (see below), whose sum is σ = 5658048. Its totient is φ = 4233600.

The previous prime is 4917779. The next prime is 4917793. The reversal of 4917781 is 1877194.

It is a 4-Lehmer number, since φ(4917781) divides (4917781-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 4917781 - 2¹ = 4917779 is a prime.

It is a super-2 number, since 2×4917781² = 48369139927922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a deceptive number, since it divides R_4917780.

It is a self number, because there is not a number n which added to its sum of digits gives 4917781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4917721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17361 + ... + 17641.

It is an arithmetic number, because the mean of its divisors is an integer number (353628).

It is a Poulet number, since it divides 2^4917780-1.

Almost surely, 2^4917781 is an apocalyptic number.

It is an amenable number.

4917781 is a deficient number, since it is larger than the sum of its proper divisors (740267).

4917781 is a wasteful number, since it uses less digits than its factorization.

4917781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372.

The product of its digits is 14112, while the sum is 37.

The square root of 4917781 is about 2217.6070436396. The cubic root of 4917781 is about 170.0551262975.

The spelling of 4917781 in words is "four million, nine hundred seventeen thousand, seven hundred eighty-one".