1247978712249 has 8 divisors (see below), whose sum is σ = 1848857351520. Its totient is φ = 831985808148.

The previous prime is 1247978712241. The next prime is 1247978712283. The reversal of 1247978712249 is 9422178797421.

1247978712249 is a `hidden beast` number, since 1 + 2 + 479 + 78 + 71 + 2 + 24 + 9 = 666.

It is not a de Polignac number, because 1247978712249 - 2³ = 1247978712241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1247978712241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23110716867 + ... + 23110716920.

It is an arithmetic number, because the mean of its divisors is an integer number (231107168940).

Almost surely, 2^{1247978712249} is an apocalyptic number.

It is an amenable number.

1247978712249 is a deficient number, since it is larger than the sum of its proper divisors (600878639271).

1247978712249 is an equidigital number, since it uses as much as digits as its factorization.

1247978712249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46221433796 (or 46221433790 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 63.

The spelling of 1247978712249 in words is "one trillion, two hundred forty-seven billion, nine hundred seventy-eight million, seven hundred twelve thousand, two hundred forty-nine".