1231351141 has 4 divisors (see below), whose sum is σ = 1231502284. Its totient is φ = 1231200000.

The previous prime is 1231351127. The next prime is 1231351151. The reversal of 1231351141 is 1411531321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1411531321 = 23 ⋅61370927.

It can be written as a sum of positive squares in 2 ways, for example, as 178089025 + 1053262116 = 13345^2 + 32454^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231351141 - 2⁷ = 1231351013 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 (1231351151) 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, 62610 + ... + 79891.

It is an arithmetic number, because the mean of its divisors is an integer number (307875571).

Almost surely, 2^1231351141 is an apocalyptic number.

It is an amenable number.

1231351141 is a deficient number, since it is larger than the sum of its proper divisors (151143).

1231351141 is an equidigital number, since it uses as much as digits as its factorization.

1231351141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151142.

The product of its digits is 360, while the sum is 22.

The square root of 1231351141 is about 35090.6132890265. The cubic root of 1231351141 is about 1071.8334481378.

Adding to 1231351141 its reverse (1411531321), we get a palindrome (2642882462).

The spelling of 1231351141 in words is "one billion, two hundred thirty-one million, three hundred fifty-one thousand, one hundred forty-one".