231387729453 has 24 divisors (see below), whose sum is σ = 354392111736. Its totient is φ = 144977280000.

The previous prime is 231387729439. The next prime is 231387729491. The reversal of 231387729453 is 354927783132.

It is a happy number.

231387729453 is a `hidden beast` number, since 231 + 3 + 8 + 77 + 294 + 53 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 48480113124 + 182907616329 = 220182^2 + 427677^2 .

It is not a de Polignac number, because 231387729453 - 2⁶ = 231387729389 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 231387729453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231387729493) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 971448 + ... + 1185953.

It is an arithmetic number, because the mean of its divisors is an integer number (14766337989).

Almost surely, 2^231387729453 is an apocalyptic number.

It is an amenable number.

231387729453 is a deficient number, since it is larger than the sum of its proper divisors (123004382283).

231387729453 is a wasteful number, since it uses less digits than its factorization.

231387729453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158125 (or 2158122 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 54.

The spelling of 231387729453 in words is "two hundred thirty-one billion, three hundred eighty-seven million, seven hundred twenty-nine thousand, four hundred fifty-three".