5021781 has 4 divisors (see below), whose sum is σ = 6695712. Its totient is φ = 3347852.

The previous prime is 5021777. The next prime is 5021789. The reversal of 5021781 is 1871205.

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 5021781 - 2² = 5021777 is a prime.

It is a super-2 number, since 2×5021781² = 50436568823922, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5021789) 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, 836961 + ... + 836966.

It is an arithmetic number, because the mean of its divisors is an integer number (1673928).

Almost surely, 2^5021781 is an apocalyptic number.

It is an amenable number.

5021781 is a deficient number, since it is larger than the sum of its proper divisors (1673931).

5021781 is a wasteful number, since it uses less digits than its factorization.

5021781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673930.

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 5021781 is about 2240.9330645961. The cubic root of 5021781 is about 171.2455348970.

Adding to 5021781 its reverse (1871205), we get a palindrome (6892986).

The spelling of 5021781 in words is "five million, twenty-one thousand, seven hundred eighty-one".