718521 has 8 divisors (see below), whose sum is σ = 976320. Its totient is φ = 469872.

The previous prime is 718513. The next prime is 718541. The reversal of 718521 is 125817.

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

It is not a de Polignac number, because 718521 - 2³ = 718513 is a prime.

718521 is a lucky number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 718491 and 718500.

It is not an unprimeable number, because it can be changed into a prime (718511) 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 7 ways as a sum of consecutive naturals, for example, 2101 + ... + 2418.

It is an arithmetic number, because the mean of its divisors is an integer number (122040).

2⁷¹⁸⁵²¹ is an apocalyptic number.

It is an amenable number.

718521 is a deficient number, since it is larger than the sum of its proper divisors (257799).

718521 is a wasteful number, since it uses less digits than its factorization.

718521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4575.

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

The square root of 718521 is about 847.6561802995. The cubic root of 718521 is about 89.5666825131.

Subtracting from 718521 its reverse (125817), we obtain a cube (592704 = 84³).

It can be divided in two parts, 7 and 18521, that added together give a triangular number (18528 = T₁₉₂).

The spelling of 718521 in words is "seven hundred eighteen thousand, five hundred twenty-one".