1311250541 has 4 divisors (see below), whose sum is σ = 1314766332. Its totient is φ = 1307734752.

The previous prime is 1311250537. The next prime is 1311250543. The reversal of 1311250541 is 1450521131.

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 1008316516 + 302934025 = 31754^2 + 17405^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311250541 - 2² = 1311250537 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 (1311250543) 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, 1757336 + ... + 1758081.

It is an arithmetic number, because the mean of its divisors is an integer number (328691583).

Almost surely, 2^1311250541 is an apocalyptic number.

It is an amenable number.

1311250541 is a deficient number, since it is larger than the sum of its proper divisors (3515791).

1311250541 is an equidigital number, since it uses as much as digits as its factorization.

1311250541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3515790.

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

The square root of 1311250541 is about 36211.1935870664. The cubic root of 1311250541 is about 1094.5322442149.

Adding to 1311250541 its reverse (1450521131), we get a palindrome (2761771672).

The spelling of 1311250541 in words is "one billion, three hundred eleven million, two hundred fifty thousand, five hundred forty-one".