1231155041 has 4 divisors (see below), whose sum is σ = 1231499412. Its totient is φ = 1230810672.

The previous prime is 1231154999. The next prime is 1231155053. The reversal of 1231155041 is 1405511321.

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 66912400 + 1164242641 = 8180^2 + 34121^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231155041 - 2¹⁰ = 1231154017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231154998 and 1231155016.

It is not an unprimeable number, because it can be changed into a prime (1231155061) 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, 166766 + ... + 173991.

It is an arithmetic number, because the mean of its divisors is an integer number (307874853).

Almost surely, 2^1231155041 is an apocalyptic number.

It is an amenable number.

1231155041 is a deficient number, since it is larger than the sum of its proper divisors (344371).

1231155041 is an equidigital number, since it uses as much as digits as its factorization.

1231155041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344370.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1231155041 is about 35087.8189832312. The cubic root of 1231155041 is about 1071.7765464978.

Adding to 1231155041 its reverse (1405511321), we get a palindrome (2636666362).

The spelling of 1231155041 in words is "one billion, two hundred thirty-one million, one hundred fifty-five thousand, forty-one".