715521 has 8 divisors (see below), whose sum is σ = 1004320. Its totient is φ = 451872.

The previous prime is 715499. The next prime is 715523. The reversal of 715521 is 125517.

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

It is not a de Polignac number, because 715521 - 2⁵ = 715489 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 715521.

It is not an unprimeable number, because it can be changed into a prime (715523) 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, 6220 + ... + 6333.

It is an arithmetic number, because the mean of its divisors is an integer number (125540).

2⁷¹⁵⁵²¹ is an apocalyptic number.

It is an amenable number.

715521 is a deficient number, since it is larger than the sum of its proper divisors (288799).

715521 is a wasteful number, since it uses less digits than its factorization.

715521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12575.

The product of its digits is 350, while the sum is 21.

The square root of 715521 is about 845.8847439220. The cubic root of 715521 is about 89.4418543916.

The spelling of 715521 in words is "seven hundred fifteen thousand, five hundred twenty-one".