1243521413 has 8 divisors (see below), whose sum is σ = 1251593280. Its totient is φ = 1235462400.

The previous prime is 1243521401. The next prime is 1243521449. The reversal of 1243521413 is 3141253421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1243521413 - 2⁴ = 1243521397 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 (1243521113) 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 7 ways as a sum of consecutive naturals, for example, 256613 + ... + 261413.

It is an arithmetic number, because the mean of its divisors is an integer number (156449160).

Almost surely, 2^1243521413 is an apocalyptic number.

It is an amenable number.

1243521413 is a deficient number, since it is larger than the sum of its proper divisors (8071867).

1243521413 is a wasteful number, since it uses less digits than its factorization.

1243521413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6427.

The product of its digits is 2880, while the sum is 26.

The square root of 1243521413 is about 35263.5989796844. The cubic root of 1243521413 is about 1075.3530948984.

Adding to 1243521413 its reverse (3141253421), we get a palindrome (4384774834).

The spelling of 1243521413 in words is "one billion, two hundred forty-three million, five hundred twenty-one thousand, four hundred thirteen".