1231135357 has 4 divisors (see below), whose sum is σ = 1254364380. Its totient is φ = 1207906336.

The previous prime is 1231135337. The next prime is 1231135369. The reversal of 1231135357 is 7535311321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1049047321 + 182088036 = 32389^2 + 13494^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231135357 - 2²⁷ = 1096917629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231135337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11614432 + ... + 11614537.

It is an arithmetic number, because the mean of its divisors is an integer number (313591095).

Almost surely, 2^1231135357 is an apocalyptic number.

It is an amenable number.

1231135357 is a deficient number, since it is larger than the sum of its proper divisors (23229023).

1231135357 is an equidigital number, since it uses as much as digits as its factorization.

1231135357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23229022.

The product of its digits is 9450, while the sum is 31.

The square root of 1231135357 is about 35087.5384859069. The cubic root of 1231135357 is about 1071.7708345278.

Adding to 1231135357 its reverse (7535311321), we get a palindrome (8766446678).

The spelling of 1231135357 in words is "one billion, two hundred thirty-one million, one hundred thirty-five thousand, three hundred fifty-seven".