9151131321 has 6 divisors (see below), whose sum is σ = 13218300810. Its totient is φ = 6100754208.

The previous prime is 9151131313. The next prime is 9151131343. The reversal of 9151131321 is 1231311519.

It is a happy number.

9151131321 is a `hidden beast` number, since 91 + 511 + 31 + 32 + 1 = 666.

9151131321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7601921721 + 1549209600 = 87189^2 + 39360^2 .

It is not a de Polignac number, because 9151131321 - 2³ = 9151131313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9151131391) 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 5 ways as a sum of consecutive naturals, for example, 508396176 + ... + 508396193.

It is an arithmetic number, because the mean of its divisors is an integer number (2203050135).

Almost surely, 2^9151131321 is an apocalyptic number.

It is an amenable number.

9151131321 is a deficient number, since it is larger than the sum of its proper divisors (4067169489).

9151131321 is a wasteful number, since it uses less digits than its factorization.

9151131321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016792375 (or 1016792372 counting only the distinct ones).

The product of its digits is 810, while the sum is 27.

The square root of 9151131321 is about 95661.5456753653. The cubic root of 9151131321 is about 2091.6624305123.

The spelling of 9151131321 in words is "nine billion, one hundred fifty-one million, one hundred thirty-one thousand, three hundred twenty-one".