231908918221407 has 48 divisors (see below), whose sum is σ = 379551639179520. Its totient is φ = 125333425945728.

The previous prime is 231908918221369. The next prime is 231908918221439. The reversal of 231908918221407 is 704122819809132.

It is a happy number.

It is not a de Polignac number, because 231908918221407 - 2⁸ = 231908918221151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231908918222407) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 385046353 + ... + 385648170.

It is an arithmetic number, because the mean of its divisors is an integer number (7907325816240).

Almost surely, 2^{231908918221407} is an apocalyptic number.

231908918221407 is a deficient number, since it is larger than the sum of its proper divisors (147642720958113).

231908918221407 is a wasteful number, since it uses less digits than its factorization.

231908918221407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770694652 (or 770694645 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 57.

The spelling of 231908918221407 in words is "two hundred thirty-one trillion, nine hundred eight billion, nine hundred eighteen million, two hundred twenty-one thousand, four hundred seven".