231321516105553 has 8 divisors (see below), whose sum is σ = 247096174415688. Its totient is φ = 215787692273664.

The previous prime is 231321516105499. The next prime is 231321516105557. The reversal of 231321516105553 is 355501615123132.

It can be written as a sum of positive squares in 4 ways, for example, as 6159246859089 + 225162269246464 = 2481783^2 + 15005408^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231321516105553 - 2⁹ = 231321516105041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231321516105557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60208617576 + ... + 60208621417.

It is an arithmetic number, because the mean of its divisors is an integer number (30887021801961).

Almost surely, 2^{231321516105553} is an apocalyptic number.

It is an amenable number.

231321516105553 is a deficient number, since it is larger than the sum of its proper divisors (15774658310135).

231321516105553 is a wasteful number, since it uses less digits than its factorization.

231321516105553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120417239123.

The product of its (nonzero) digits is 405000, while the sum is 43.

The spelling of 231321516105553 in words is "two hundred thirty-one trillion, three hundred twenty-one billion, five hundred sixteen million, one hundred five thousand, five hundred fifty-three".