1243005125 has 8 divisors (see below), whose sum is σ = 1551270552. Its totient is φ = 994404000.

The previous prime is 1243005119. The next prime is 1243005139. The reversal of 1243005125 is 5215003421.

It can be written as a sum of positive squares in 4 ways, for example, as 149181796 + 1093823329 = 12214^2 + 33073^2 .

It is not a de Polignac number, because 1243005125 - 2²⁶ = 1175896261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243005125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4971896 + ... + 4972145.

It is an arithmetic number, because the mean of its divisors is an integer number (193908819).

Almost surely, 2^1243005125 is an apocalyptic number.

It is an amenable number.

1243005125 is a deficient number, since it is larger than the sum of its proper divisors (308265427).

1243005125 is an frugal number, since it uses more digits than its factorization.

1243005125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9944056 (or 9944046 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1243005125 is about 35256.2778097745. The cubic root of 1243005125 is about 1075.2042517969.

Adding to 1243005125 its reverse (5215003421), we get a palindrome (6458008546).

The spelling of 1243005125 in words is "one billion, two hundred forty-three million, five thousand, one hundred twenty-five".