9213641287 has 4 divisors (see below), whose sum is σ = 9409676256. Its totient is φ = 9017606320.

The previous prime is 9213641257. The next prime is 9213641293. The reversal of 9213641287 is 7821463129.

9213641287 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7821463129 = 101 ⋅77440229.

It is a cyclic number.

It is not a de Polignac number, because 9213641287 - 2⁷ = 9213641159 is a prime.

It is a super-2 number, since 2×9213641287² (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 (9213641207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98017414 + ... + 98017507.

It is an arithmetic number, because the mean of its divisors is an integer number (2352419064).

Almost surely, 2^9213641287 is an apocalyptic number.

9213641287 is a deficient number, since it is larger than the sum of its proper divisors (196034969).

9213641287 is a wasteful number, since it uses less digits than its factorization.

9213641287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196034968.

The product of its digits is 145152, while the sum is 43.

The square root of 9213641287 is about 95987.7142503143. The cubic root of 9213641287 is about 2096.4142350362.

The spelling of 9213641287 in words is "nine billion, two hundred thirteen million, six hundred forty-one thousand, two hundred eighty-seven".