5145781 has 8 divisors (see below), whose sum is σ = 5500440. Its totient is φ = 4796928.

The previous prime is 5145779. The next prime is 5145809. The reversal of 5145781 is 1875415.

It can be written as a sum of positive squares in 4 ways, for example, as 980100 + 4165681 = 990^2 + 2041^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5145781 - 2¹ = 5145779 is a prime.

It is a super-2 number, since 2×5145781² = 52958124199922, which contains 22 as substring.

It is a Duffinian number.

5145781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5145761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465 + ... + 3241.

It is an arithmetic number, because the mean of its divisors is an integer number (687555).

Almost surely, 2^5145781 is an apocalyptic number.

It is an amenable number.

5145781 is a deficient number, since it is larger than the sum of its proper divisors (354659).

5145781 is a wasteful number, since it uses less digits than its factorization.

5145781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2903.

The product of its digits is 5600, while the sum is 31.

The square root of 5145781 is about 2268.4313963618. The cubic root of 5145781 is about 172.6435799613.

The spelling of 5145781 in words is "five million, one hundred forty-five thousand, seven hundred eighty-one".