1247838682489 has 81 divisors (see below), whose sum is σ = 1581477523983. Its totient is φ = 981553368096.

The previous prime is 1247838682469. The next prime is 1247838682547. The reversal of 1247838682489 is 9842868387421.

The square root of 1247838682489 is 1117067.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1116583189225 + 131255493264 = 1056685^2 + 362292^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1247838682489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1247838682469) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 5497086594 + ... + 5497086820.

Almost surely, 2^{1247838682489} is an apocalyptic number.

1247838682489 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1247838682489 is the 1117067-th square number.

1247838682489 is the 558534-th centered octagonal number.

It is an amenable number.

1247838682489 is a deficient number, since it is larger than the sum of its proper divisors (333638841494).

1247838682489 is an frugal number, since it uses more digits than its factorization.

1247838682489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 290 counting only the distinct ones).

The product of its digits is 297271296, while the sum is 70.

The spelling of 1247838682489 in words is "one trillion, two hundred forty-seven billion, eight hundred thirty-eight million, six hundred eighty-two thousand, four hundred eighty-nine".