3216137521 has 3 divisors (see below), whose sum is σ = 3216194233. Its totient is φ = 3216080810.

The previous prime is 3216137489. The next prime is 3216137531. The reversal of 3216137521 is 1257316123.

It is a happy number.

The square root of 3216137521 is 56711.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 3216137521 - 2⁵ = 3216137489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3216137531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 28356 + ... + 85066.

Almost surely, 2^3216137521 is an apocalyptic number.

3216137521 is the 56711-st square number.

3216137521 is the 28356-th centered octagonal number.

It is an amenable number.

3216137521 is a deficient number, since it is larger than the sum of its proper divisors (56712).

3216137521 is an frugal number, since it uses more digits than its factorization.

3216137521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113422 (or 56711 counting only the distinct ones).

The product of its digits is 7560, while the sum is 31.

The cubic root of 3216137521 is about 1476.0855777001.

The spelling of 3216137521 in words is "three billion, two hundred sixteen million, one hundred thirty-seven thousand, five hundred twenty-one".