231201132309 has 24 divisors (see below), whose sum is σ = 381728839232. Its totient is φ = 132092959680.

The previous prime is 231201132307. The next prime is 231201132329. The reversal of 231201132309 is 903231102132.

231201132309 is a `hidden beast` number, since 2 + 312 + 0 + 11 + 32 + 309 = 666.

It is not a de Polignac number, because 231201132309 - 2¹ = 231201132307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231201132307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80454 + ... + 684744.

Almost surely, 2^231201132309 is an apocalyptic number.

It is an amenable number.

231201132309 is a deficient number, since it is larger than the sum of its proper divisors (150527706923).

231201132309 is a wasteful number, since it uses less digits than its factorization.

231201132309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610377 (or 610374 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The spelling of 231201132309 in words is "two hundred thirty-one billion, two hundred one million, one hundred thirty-two thousand, three hundred nine".