1311251141 has 4 divisors (see below), whose sum is σ = 1324769292. Its totient is φ = 1297732992.

The previous prime is 1311251131. The next prime is 1311251197. The reversal of 1311251141 is 1411521131.

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 466128100 + 845123041 = 21590^2 + 29071^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311251141 - 2⁶ = 1311251077 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 (1311251131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6758930 + ... + 6759123.

It is an arithmetic number, because the mean of its divisors is an integer number (331192323).

Almost surely, 2^1311251141 is an apocalyptic number.

It is an amenable number.

1311251141 is a deficient number, since it is larger than the sum of its proper divisors (13518151).

1311251141 is an equidigital number, since it uses as much as digits as its factorization.

1311251141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13518150.

The product of its digits is 120, while the sum is 20.

The square root of 1311251141 is about 36211.2018717965. The cubic root of 1311251141 is about 1094.5324111596.

Adding to 1311251141 its reverse (1411521131), we get a palindrome (2722772272).

The spelling of 1311251141 in words is "one billion, three hundred eleven million, two hundred fifty-one thousand, one hundred forty-one".