9216521557 has 8 divisors (see below), whose sum is σ = 9548183552. Its totient is φ = 8887006800.

The previous prime is 9216521519. The next prime is 9216521579. The reversal of 9216521557 is 7551256129.

9216521557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 9216521557 - 2³¹ = 7069037909 is a prime.

It is a super-2 number, since 2×9216521557² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9216521357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 528069 + ... + 545242.

It is an arithmetic number, because the mean of its divisors is an integer number (1193522944).

Almost surely, 2^9216521557 is an apocalyptic number.

It is an amenable number.

9216521557 is a deficient number, since it is larger than the sum of its proper divisors (331661995).

9216521557 is a wasteful number, since it uses less digits than its factorization.

9216521557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073619.

The product of its digits is 189000, while the sum is 43.

The square root of 9216521557 is about 96002.7164042768. The cubic root of 9216521557 is about 2096.6326651424.

The spelling of 9216521557 in words is "nine billion, two hundred sixteen million, five hundred twenty-one thousand, five hundred fifty-seven".