1131240213 has 6 divisors (see below), whose sum is σ = 1634013654. Its totient is φ = 754160136.

The previous prime is 1131240191. The next prime is 1131240269. The reversal of 1131240213 is 3120421311.

It can be written as a sum of positive squares in only one way, i.e., 751691889 + 379548324 = 27417^2 + 19482^2 .

It is not a de Polignac number, because 1131240213 - 2⁹ = 1131239701 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131240013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62846670 + ... + 62846687.

It is an arithmetic number, because the mean of its divisors is an integer number (272335609).

Almost surely, 2^1131240213 is an apocalyptic number.

It is an amenable number.

1131240213 is a deficient number, since it is larger than the sum of its proper divisors (502773441).

1131240213 is a wasteful number, since it uses less digits than its factorization.

1131240213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125693363 (or 125693360 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1131240213 is about 33633.9146249734. The cubic root of 1131240213 is about 1041.9613545029.

Adding to 1131240213 its reverse (3120421311), we get a palindrome (4251661524).

The spelling of 1131240213 in words is "one billion, one hundred thirty-one million, two hundred forty thousand, two hundred thirteen".