9139665231 has 12 divisors (see below), whose sum is σ = 13210660008. Its totient is φ = 6088992624.

The previous prime is 9139665229. The next prime is 9139665233. The reversal of 9139665231 is 1325669319.

9139665231 is a `hidden beast` number, since 91 + 39 + 6 + 6 + 523 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (9139665229) and next prime (9139665233).

It is not a de Polignac number, because 9139665231 - 2¹ = 9139665229 is a prime.

It is a super-2 number, since 2×9139665231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9139665233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 329040 + ... + 355733.

It is an arithmetic number, because the mean of its divisors is an integer number (1100888334).

Almost surely, 2^9139665231 is an apocalyptic number.

9139665231 is a deficient number, since it is larger than the sum of its proper divisors (4070994777).

9139665231 is a wasteful number, since it uses less digits than its factorization.

9139665231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686262 (or 686259 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 9139665231 is about 95601.5963831149. The cubic root of 9139665231 is about 2090.7884688657.

The spelling of 9139665231 in words is "nine billion, one hundred thirty-nine million, six hundred sixty-five thousand, two hundred thirty-one".