9221961581 has 8 divisors (see below), whose sum is σ = 11094089280. Its totient is φ = 7488510048.

The previous prime is 9221961577. The next prime is 9221961587. The reversal of 9221961581 is 1851691229.

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 9221961581 - 2² = 9221961577 is a prime.

It is a super-2 number, since 2×9221961581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9221961587) 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, 34668896 + ... + 34669161.

It is an arithmetic number, because the mean of its divisors is an integer number (1386761160).

Almost surely, 2^9221961581 is an apocalyptic number.

It is an amenable number.

9221961581 is a deficient number, since it is larger than the sum of its proper divisors (1872127699).

9221961581 is a wasteful number, since it uses less digits than its factorization.

9221961581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69338083.

The product of its digits is 77760, while the sum is 44.

The square root of 9221961581 is about 96031.0448813299. The cubic root of 9221961581 is about 2097.0450943732.

The spelling of 9221961581 in words is "nine billion, two hundred twenty-one million, nine hundred sixty-one thousand, five hundred eighty-one".