521007 has 4 divisors (see below), whose sum is σ = 694680. Its totient is φ = 347336.

The previous prime is 520981. The next prime is 521009. The reversal of 521007 is 700125.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 521007 - 2⁶ = 520943 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521009) 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, 86832 + ... + 86837.

It is an arithmetic number, because the mean of its divisors is an integer number (173670).

2⁵²¹⁰⁰⁷ is an apocalyptic number.

521007 is a deficient number, since it is larger than the sum of its proper divisors (173673).

521007 is a wasteful number, since it uses less digits than its factorization.

521007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173672.

The product of its (nonzero) digits is 70, while the sum is 15.

The square root of 521007 is about 721.8081462549. The cubic root of 521007 is about 80.4663903006.

It can be divided in two parts, 5 and 21007, that added together give a palindrome (21012).

The spelling of 521007 in words is "five hundred twenty-one thousand, seven".