201231522 has 24 divisors (see below), whose sum is σ = 451037340. Its totient is φ = 64764000.

The previous prime is 201231517. The next prime is 201231553. The reversal of 201231522 is 225132102.

201231522 is a `hidden beast` number, since 20 + 123 + 1 + 522 = 666.

201231522 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 199911321 + 1320201 = 14139^2 + 1149^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 201231495 and 201231504.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192229 + ... + 193272.

Almost surely, 2^201231522 is an apocalyptic number.

201231522 is an abundant number, since it is smaller than the sum of its proper divisors (249805818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201231522 is a wasteful number, since it uses less digits than its factorization.

201231522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385538 (or 385535 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 201231522 is about 14185.6096802358. The cubic root of 201231522 is about 586.0014230378.

Adding to 201231522 its reverse (225132102), we get a palindrome (426363624).

The spelling of 201231522 in words is "two hundred one million, two hundred thirty-one thousand, five hundred twenty-two".