1243541225 has 6 divisors (see below), whose sum is σ = 1541991150. Its totient is φ = 994832960.

The previous prime is 1243541213. The next prime is 1243541227. The reversal of 1243541225 is 5221453421.

It can be written as a sum of positive squares in 3 ways, for example, as 3374569 + 1240166656 = 1837^2 + 35216^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1243541225 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1243541227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24870800 + ... + 24870849.

It is an arithmetic number, because the mean of its divisors is an integer number (256998525).

Almost surely, 2^1243541225 is an apocalyptic number.

It is an amenable number.

1243541225 is a deficient number, since it is larger than the sum of its proper divisors (298449925).

1243541225 is an equidigital number, since it uses as much as digits as its factorization.

1243541225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49741659 (or 49741654 counting only the distinct ones).

The product of its digits is 9600, while the sum is 29.

The square root of 1243541225 is about 35263.8798914697. The cubic root of 1243541225 is about 1075.3588057724.

Adding to 1243541225 its reverse (5221453421), we get a palindrome (6464994646).

The spelling of 1243541225 in words is "one billion, two hundred forty-three million, five hundred forty-one thousand, two hundred twenty-five".