201231101231 has 4 divisors (see below), whose sum is σ = 201233071200. Its totient is φ = 201229131264.

The previous prime is 201231101213. The next prime is 201231101233. The reversal of 201231101231 is 132101132102.

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 201231101231 - 2¹⁰ = 201231100207 is a prime.

It is a super-2 number, since 2×201231101231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201231101233) 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, 822866 + ... + 1039023.

It is an arithmetic number, because the mean of its divisors is an integer number (50308267800).

Almost surely, 2^201231101231 is an apocalyptic number.

201231101231 is a deficient number, since it is larger than the sum of its proper divisors (1969969).

201231101231 is a wasteful number, since it uses less digits than its factorization.

201231101231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969968.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 201231101231 its reverse (132101132102), we get a palindrome (333332233333).

The spelling of 201231101231 in words is "two hundred one billion, two hundred thirty-one million, one hundred one thousand, two hundred thirty-one".