16313521 has 9 divisors (see below), whose sum is σ = 19009899. Its totient is φ = 13958784.

The previous prime is 16313519. The next prime is 16313527. The reversal of 16313521 is 12531361.

It is a happy number.

The square root of 16313521 is 4039.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 16200625 + 112896 = 4025^2 + 336^2 .

It is not a de Polignac number, because 16313521 - 2¹ = 16313519 is a prime.

It is a super-2 number, since 2×16313521² = 532261934834882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16313492 and 16313501.

It is not an unprimeable number, because it can be changed into a prime (16313527) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 27985 + ... + 28561.

It is an arithmetic number, because the mean of its divisors is an integer number (2112211).

Almost surely, 2^16313521 is an apocalyptic number.

16313521 is the 4039-th square number.

16313521 is the 2020-th centered octagonal number.

It is an amenable number.

16313521 is a deficient number, since it is larger than the sum of its proper divisors (2696378).

16313521 is an frugal number, since it uses more digits than its factorization.

16313521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168 (or 584 counting only the distinct ones).

The product of its digits is 540, while the sum is 22.

The cubic root of 16313521 is about 253.6194572290.

Adding to 16313521 its reverse (12531361), we get a palindrome (28844882).

The spelling of 16313521 in words is "sixteen million, three hundred thirteen thousand, five hundred twenty-one".