231545053211 has 4 divisors (see below), whose sum is σ = 231566681424. Its totient is φ = 231523425000.

The previous prime is 231545053189. The next prime is 231545053213. The reversal of 231545053211 is 112350545132.

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

It is a cyclic number.

It is not a de Polignac number, because 231545053211 - 2⁶ = 231545053147 is a prime.

It is a super-2 number, since 2×231545053211² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231545053213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10798040 + ... + 10819461.

It is an arithmetic number, because the mean of its divisors is an integer number (57891670356).

Almost surely, 2^231545053211 is an apocalyptic number.

231545053211 is a deficient number, since it is larger than the sum of its proper divisors (21628213).

231545053211 is a wasteful number, since it uses less digits than its factorization.

231545053211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21628212.

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 231545053211 its reverse (112350545132), we get a palindrome (343895598343).

The spelling of 231545053211 in words is "two hundred thirty-one billion, five hundred forty-five million, fifty-three thousand, two hundred eleven".