231551345535211 has 4 divisors (see below), whose sum is σ = 249362987499472. Its totient is φ = 213739703570952.

The previous prime is 231551345535193. The next prime is 231551345535241. The reversal of 231551345535211 is 112535543155132.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 231551345535211 - 2⁹ = 231551345534699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231551345535241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8905820982111 + ... + 8905820982136.

It is an arithmetic number, because the mean of its divisors is an integer number (62340746874868).

Almost surely, 2^{231551345535211} is an apocalyptic number.

231551345535211 is a deficient number, since it is larger than the sum of its proper divisors (17811641964261).

231551345535211 is a wasteful number, since it uses less digits than its factorization.

231551345535211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17811641964260.

The product of its digits is 1350000, while the sum is 46.

The spelling of 231551345535211 in words is "two hundred thirty-one trillion, five hundred fifty-one billion, three hundred forty-five million, five hundred thirty-five thousand, two hundred eleven".