521316523 has 8 divisors (see below), whose sum is σ = 641620448. Its totient is φ = 412470144.

The previous prime is 521316511. The next prime is 521316583. The reversal of 521316523 is 325613125.

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

It is a cyclic number.

It is not a de Polignac number, because 521316523 - 2⁹ = 521316011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521316491 and 521316500.

It is not an unprimeable number, because it can be changed into a prime (521316503) 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, 2864286 + ... + 2864467.

It is an arithmetic number, because the mean of its divisors is an integer number (80202556).

Almost surely, 2^521316523 is an apocalyptic number.

521316523 is a deficient number, since it is larger than the sum of its proper divisors (120303925).

521316523 is a wasteful number, since it uses less digits than its factorization.

521316523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5728773.

The product of its digits is 5400, while the sum is 28.

The square root of 521316523 is about 22832.3569304616. The cubic root of 521316523 is about 804.8232179994.

Adding to 521316523 its reverse (325613125), we get a palindrome (846929648).

It can be divided in two parts, 5213 and 16523, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 521316523 in words is "five hundred twenty-one million, three hundred sixteen thousand, five hundred twenty-three".