1231125535 has 4 divisors (see below), whose sum is σ = 1477350648. Its totient is φ = 984900424.

The previous prime is 1231125529. The next prime is 1231125547. The reversal of 1231125535 is 5355211321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5355211321 = 2069 ⋅2588309.

It is a cyclic number.

It is not a de Polignac number, because 1231125535 - 2³ = 1231125527 is a prime.

It is a super-4 number, since 4×1231125535⁴ (a number of 37 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123112549 + ... + 123112558.

It is an arithmetic number, because the mean of its divisors is an integer number (369337662).

Almost surely, 2^1231125535 is an apocalyptic number.

1231125535 is a deficient number, since it is larger than the sum of its proper divisors (246225113).

1231125535 is an equidigital number, since it uses as much as digits as its factorization.

1231125535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246225112.

The product of its digits is 4500, while the sum is 28.

The square root of 1231125535 is about 35087.3985214065. The cubic root of 1231125535 is about 1071.7679843237.

Adding to 1231125535 its reverse (5355211321), we get a palindrome (6586336856).

The spelling of 1231125535 in words is "one billion, two hundred thirty-one million, one hundred twenty-five thousand, five hundred thirty-five".