5261721 has 8 divisors (see below), whose sum is σ = 7428384. Its totient is φ = 3301440.

The previous prime is 5261719. The next prime is 5261741. The reversal of 5261721 is 1271625.

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

It is not a de Polignac number, because 5261721 - 2¹ = 5261719 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 5261691 and 5261700.

It is not an unprimeable number, because it can be changed into a prime (5261701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51535 + ... + 51636.

It is an arithmetic number, because the mean of its divisors is an integer number (928548).

Almost surely, 2^5261721 is an apocalyptic number.

5261721 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

5261721 is a deficient number, since it is larger than the sum of its proper divisors (2166663).

5261721 is a wasteful number, since it uses less digits than its factorization.

5261721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103191.

The product of its digits is 840, while the sum is 24.

The square root of 5261721 is about 2293.8441533810. The cubic root of 5261721 is about 173.9305774052.

It can be divided in two parts, 5 and 261721, that added together give a triangular number (261726 = T₇₂₃).

The spelling of 5261721 in words is "five million, two hundred sixty-one thousand, seven hundred twenty-one".