1244819945 has 4 divisors (see below), whose sum is σ = 1493783940. Its totient is φ = 995855952.

The previous prime is 1244819929. The next prime is 1244819959. The reversal of 1244819945 is 5499184421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 173501584 + 1071318361 = 13172^2 + 32731^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244819945 - 2⁴ = 1244819929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1244819945.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124481990 + ... + 124481999.

It is an arithmetic number, because the mean of its divisors is an integer number (373445985).

Almost surely, 2^1244819945 is an apocalyptic number.

It is an amenable number.

1244819945 is a deficient number, since it is larger than the sum of its proper divisors (248963995).

1244819945 is an equidigital number, since it uses as much as digits as its factorization.

1244819945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248963994.

The product of its digits is 414720, while the sum is 47.

The square root of 1244819945 is about 35282.0059662146. The cubic root of 1244819945 is about 1075.7272727831.

The spelling of 1244819945 in words is "one billion, two hundred forty-four million, eight hundred nineteen thousand, nine hundred forty-five".