201131031231 has 72 divisors (see below), whose sum is σ = 342435759120. Its totient is φ = 117257912064.

The previous prime is 201131031223. The next prime is 201131031239. The reversal of 201131031231 is 132130131102.

201131031231 is a `hidden beast` number, since 2 + 0 + 11 + 310 + 312 + 31 = 666.

It is an interprime number because it is at equal distance from previous prime (201131031223) and next prime (201131031239).

It is not a de Polignac number, because 201131031231 - 2³ = 201131031223 is a prime.

It is a super-2 number, since 2×201131031231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201131031239) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1052215 + ... + 1228583.

It is an arithmetic number, because the mean of its divisors is an integer number (4756052210).

Almost surely, 2^201131031231 is an apocalyptic number.

201131031231 is a deficient number, since it is larger than the sum of its proper divisors (141304727889).

201131031231 is a wasteful number, since it uses less digits than its factorization.

201131031231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176435 (or 176404 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 201131031231 its reverse (132130131102), we get a palindrome (333261162333).

The spelling of 201131031231 in words is "two hundred one billion, one hundred thirty-one million, thirty-one thousand, two hundred thirty-one".