1243206025 has 6 divisors (see below), whose sum is σ = 1541575502. Its totient is φ = 994564800.

The previous prime is 1243205947. The next prime is 1243206049. The reversal of 1243206025 is 5206023421.

It can be written as a sum of positive squares in 3 ways, for example, as 16875664 + 1226330361 = 4108^2 + 35019^2 .

It is not a de Polignac number, because 1243206025 - 2¹³ = 1243197833 is a prime.

It is a super-2 number, since 2×1243206025² = 3091122441192601250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 49728241 = 1243206025 / (1 + 2 + 4 + 3 + 2 + 0 + 6 + 0 + 2 + 5).

It is a Duffinian number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 24864096 + ... + 24864145.

Almost surely, 2^1243206025 is an apocalyptic number.

It is an amenable number.

1243206025 is a deficient number, since it is larger than the sum of its proper divisors (298369477).

1243206025 is an equidigital number, since it uses as much as digits as its factorization.

1243206025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49728251 (or 49728246 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1243206025 is about 35259.1268326372. The cubic root of 1243206025 is about 1075.2621751027.

Adding to 1243206025 its reverse (5206023421), we get a palindrome (6449229446).

The spelling of 1243206025 in words is "one billion, two hundred forty-three million, two hundred six thousand, twenty-five".