1211540241 has 16 divisors (see below), whose sum is σ = 1711827648. Its totient is φ = 759552000.

The previous prime is 1211540219. The next prime is 1211540251. The reversal of 1211540241 is 1420451121.

It is not a de Polignac number, because 1211540241 - 2¹¹ = 1211538193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211540251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56641 + ... + 75041.

It is an arithmetic number, because the mean of its divisors is an integer number (106989228).

Almost surely, 2^1211540241 is an apocalyptic number.

It is an amenable number.

1211540241 is a deficient number, since it is larger than the sum of its proper divisors (500287407).

1211540241 is a wasteful number, since it uses less digits than its factorization.

1211540241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19712.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1211540241 is about 34807.1866286260. The cubic root of 1211540241 is about 1066.0541894761.

Adding to 1211540241 its reverse (1420451121), we get a palindrome (2631991362).

The spelling of 1211540241 in words is "one billion, two hundred eleven million, five hundred forty thousand, two hundred forty-one".