1243512445 has 12 divisors (see below), whose sum is σ = 1735842204. Its totient is φ = 852694080.

The previous prime is 1243512433. The next prime is 1243512461. The reversal of 1243512445 is 5442153421.

It can be written as a sum of positive squares in 2 ways, for example, as 232654009 + 1010858436 = 15253^2 + 31794^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1243512445 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2537536 + ... + 2538025.

It is an arithmetic number, because the mean of its divisors is an integer number (144653517).

Almost surely, 2^1243512445 is an apocalyptic number.

It is an amenable number.

1243512445 is a deficient number, since it is larger than the sum of its proper divisors (492329759).

1243512445 is an equidigital number, since it uses as much as digits as its factorization.

1243512445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5075580 (or 5075573 counting only the distinct ones).

The product of its digits is 19200, while the sum is 31.

The square root of 1243512445 is about 35263.4718228367. The cubic root of 1243512445 is about 1075.3505098230.

Adding to 1243512445 its reverse (5442153421), we get a palindrome (6685665866).

The spelling of 1243512445 in words is "one billion, two hundred forty-three million, five hundred twelve thousand, four hundred forty-five".