201231511 has 6 divisors (see below), whose sum is σ = 217901760. Its totient is φ = 185752008.

The previous prime is 201231479. The next prime is 201231517. The reversal of 201231511 is 115132102.

It is not a de Polignac number, because 201231511 - 2⁵ = 201231479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201231517) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 595191 + ... + 595528.

It is an arithmetic number, because the mean of its divisors is an integer number (36316960).

Almost surely, 2^201231511 is an apocalyptic number.

201231511 is a deficient number, since it is larger than the sum of its proper divisors (16670249).

201231511 is a wasteful number, since it uses less digits than its factorization.

201231511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190745 (or 1190732 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 201231511 is about 14185.6092925190. The cubic root of 201231511 is about 586.0014123602.

Adding to 201231511 its reverse (115132102), we get a palindrome (316363613).

The spelling of 201231511 in words is "two hundred one million, two hundred thirty-one thousand, five hundred eleven".