1213505241 has 16 divisors (see below), whose sum is σ = 1749960576. Its totient is φ = 743561856.

The previous prime is 1213505239. The next prime is 1213505287. The reversal of 1213505241 is 1425053121.

It is a happy number.

It is not a de Polignac number, because 1213505241 - 2¹ = 1213505239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213505201) 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, 57685 + ... + 75858.

It is an arithmetic number, because the mean of its divisors is an integer number (109372536).

Almost surely, 2^1213505241 is an apocalyptic number.

It is an amenable number.

1213505241 is a deficient number, since it is larger than the sum of its proper divisors (536455335).

1213505241 is a wasteful number, since it uses less digits than its factorization.

1213505241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133792.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1213505241 is about 34835.4021219793. The cubic root of 1213505241 is about 1066.6302234402.

Adding to 1213505241 its reverse (1425053121), we get a palindrome (2638558362).

The spelling of 1213505241 in words is "one billion, two hundred thirteen million, five hundred five thousand, two hundred forty-one".