1243553213 has 48 divisors (see below), whose sum is σ = 1633457664. Its totient is φ = 938488320.

The previous prime is 1243553209. The next prime is 1243553221. The reversal of 1243553213 is 3123553421.

It is a happy number.

It is not a de Polignac number, because 1243553213 - 2² = 1243553209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243553203) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 899783 + ... + 901163.

It is an arithmetic number, because the mean of its divisors is an integer number (34030368).

Almost surely, 2^1243553213 is an apocalyptic number.

It is an amenable number.

1243553213 is a deficient number, since it is larger than the sum of its proper divisors (389904451).

1243553213 is a wasteful number, since it uses less digits than its factorization.

1243553213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482 (or 1475 counting only the distinct ones).

The product of its digits is 10800, while the sum is 29.

The square root of 1243553213 is about 35264.0498666843. The cubic root of 1243553213 is about 1075.3622613233.

The spelling of 1243553213 in words is "one billion, two hundred forty-three million, five hundred fifty-three thousand, two hundred thirteen".