1231433523 has 20 divisors (see below), whose sum is σ = 1840656840. Its totient is φ = 820461312.

The previous prime is 1231433521. The next prime is 1231433537. The reversal of 1231433523 is 3253341321.

1231433523 is a `hidden beast` number, since 12 + 314 + 335 + 2 + 3 = 666.

1231433523 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1231433523 - 2¹ = 1231433521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1231433521) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 173011 + ... + 179987.

It is an arithmetic number, because the mean of its divisors is an integer number (92032842).

Almost surely, 2^1231433523 is an apocalyptic number.

1231433523 is a deficient number, since it is larger than the sum of its proper divisors (609223317).

1231433523 is an equidigital number, since it uses as much as digits as its factorization.

1231433523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9168 (or 9159 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 1231433523 is about 35091.7871160760. The cubic root of 1231433523 is about 1071.8573508278.

Adding to 1231433523 its reverse (3253341321), we get a palindrome (4484774844).

The spelling of 1231433523 in words is "one billion, two hundred thirty-one million, four hundred thirty-three thousand, five hundred twenty-three".