1231541335253 has 6 divisors (see below), whose sum is σ = 1250196900246. Its totient is φ = 1213160116872.

The previous prime is 1231541335249. The next prime is 1231541335289. The reversal of 1231541335253 is 3525331451321.

It can be written as a sum of positive squares in only one way, i.e., 729628597489 + 501912737764 = 854183^2 + 708458^2 .

It is not a de Polignac number, because 1231541335253 - 2² = 1231541335249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231541335243) 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, 137168750 + ... + 137177727.

It is an arithmetic number, because the mean of its divisors is an integer number (208366150041).

Almost surely, 2^{1231541335253} is an apocalyptic number.

It is an amenable number.

1231541335253 is a deficient number, since it is larger than the sum of its proper divisors (18655564993).

1231541335253 is an frugal number, since it uses more digits than its factorization.

1231541335253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274346611 (or 274346544 counting only the distinct ones).

The product of its digits is 162000, while the sum is 38.

Adding to 1231541335253 its reverse (3525331451321), we get a palindrome (4756872786574).

The spelling of 1231541335253 in words is "one trillion, two hundred thirty-one billion, five hundred forty-one million, three hundred thirty-five thousand, two hundred fifty-three".