4913781 has 4 divisors (see below), whose sum is σ = 6551712. Its totient is φ = 3275852.

The previous prime is 4913773. The next prime is 4913791. The reversal of 4913781 is 1873194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4913781 - 2³ = 4913773 is a prime.

It is a super-3 number, since 3×4913781³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4913791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 818961 + ... + 818966.

It is an arithmetic number, because the mean of its divisors is an integer number (1637928).

Almost surely, 2^4913781 is an apocalyptic number.

It is an amenable number.

4913781 is a deficient number, since it is larger than the sum of its proper divisors (1637931).

4913781 is a wasteful number, since it uses less digits than its factorization.

4913781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637930.

The product of its digits is 6048, while the sum is 33.

The square root of 4913781 is about 2216.7049871374. The cubic root of 4913781 is about 170.0090075965.

The spelling of 4913781 in words is "four million, nine hundred thirteen thousand, seven hundred eighty-one".