231908918221408 has 12 divisors (see below), whose sum is σ = 456570682748460. Its totient is φ = 115954459110688.

The previous prime is 231908918221369. The next prime is 231908918221439. The reversal of 231908918221408 is 804122819809132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3623576847178 + ... + 3623576847241.

It is an arithmetic number, because the mean of its divisors is an integer number (38047556895705).

Almost surely, 2^{231908918221408} is an apocalyptic number.

It is an amenable number.

231908918221408 is a deficient number, since it is larger than the sum of its proper divisors (224661764527052).

231908918221408 is an equidigital number, since it uses as much as digits as its factorization.

231908918221408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7247153694429 (or 7247153694421 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 58.

The spelling of 231908918221408 in words is "two hundred thirty-one trillion, nine hundred eight billion, nine hundred eighteen million, two hundred twenty-one thousand, four hundred eight".