1243213441 has 12 divisors (see below), whose sum is σ = 1302758100. Its totient is φ = 1184977248.

The previous prime is 1243213423. The next prime is 1243213507. The reversal of 1243213441 is 1443123421.

It can be written as a sum of positive squares in 2 ways, for example, as 249640000 + 993573441 = 15800^2 + 31521^2 .

It is not a de Polignac number, because 1243213441 - 2⁵ = 1243213409 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 (1243213241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 177555 + ... + 184423.

It is an arithmetic number, because the mean of its divisors is an integer number (108563175).

Almost surely, 2^1243213441 is an apocalyptic number.

It is an amenable number.

1243213441 is a deficient number, since it is larger than the sum of its proper divisors (59544659).

1243213441 is an frugal number, since it uses more digits than its factorization.

1243213441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7056 (or 6977 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

The square root of 1243213441 is about 35259.2319967409. The cubic root of 1243213441 is about 1075.2643131576.

Adding to 1243213441 its reverse (1443123421), we get a palindrome (2686336862).

The spelling of 1243213441 in words is "one billion, two hundred forty-three million, two hundred thirteen thousand, four hundred forty-one".