5165781 has 4 divisors (see below), whose sum is σ = 6887712. Its totient is φ = 3443852.

The previous prime is 5165779. The next prime is 5165791. The reversal of 5165781 is 1875615.

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 5165781 - 2¹ = 5165779 is a prime.

It is a super-2 number, since 2×5165781² = 53370586679922, which contains 22 as substring.

It is a D-number.

5165781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5165711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 860961 + ... + 860966.

It is an arithmetic number, because the mean of its divisors is an integer number (1721928).

Almost surely, 2^5165781 is an apocalyptic number.

It is an amenable number.

5165781 is a deficient number, since it is larger than the sum of its proper divisors (1721931).

5165781 is a wasteful number, since it uses less digits than its factorization.

5165781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721930.

The product of its digits is 8400, while the sum is 33.

The square root of 5165781 is about 2272.8354537889. The cubic root of 5165781 is about 172.8669608781.

The spelling of 5165781 in words is "five million, one hundred sixty-five thousand, seven hundred eighty-one".