201131020231 has 4 divisors (see below), whose sum is σ = 202480893000. Its totient is φ = 199781147464.

The previous prime is 201131020219. The next prime is 201131020271. The reversal of 201131020231 is 132020131102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132020131102 = 2 ⋅66010065551.

It is a cyclic number.

It is not a de Polignac number, because 201131020231 - 2³⁵ = 166771281863 is a prime.

It is a super-2 number, since 2×201131020231² (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 (201131020201) 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, 674936161 + ... + 674936458.

It is an arithmetic number, because the mean of its divisors is an integer number (50620223250).

Almost surely, 2^201131020231 is an apocalyptic number.

201131020231 is a deficient number, since it is larger than the sum of its proper divisors (1349872769).

201131020231 is a wasteful number, since it uses less digits than its factorization.

201131020231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349872768.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 201131020231 its reverse (132020131102), we get a palindrome (333151151333).

The spelling of 201131020231 in words is "two hundred one billion, one hundred thirty-one million, twenty thousand, two hundred thirty-one".