1243708957089 has 135 divisors (see below), whose sum is σ = 2038733191803. Its totient is φ = 755421230592.

The previous prime is 1243708957037. The next prime is 1243708957091. The reversal of 1243708957089 is 9807598073421.

The square root of 1243708957089 is 1115217.

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

1243708957089 is a `hidden beast` number, since 1 + 24 + 37 + 0 + 8 + 9 + 570 + 8 + 9 = 666.

It can be written as a sum of positive squares in 13 ways, for example, as 405737150625 + 837971806464 = 636975^2 + 915408^2 .

It is not a de Polignac number, because 1243708957089 - 2²⁷ = 1243574739361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1243708957189) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 6313243339 + ... + 6313243535.

Almost surely, 2^{1243708957089} is an apocalyptic number.

1243708957089 is the 1115217-th square number.

1243708957089 is the 557609-th centered octagonal number.

It is an amenable number.

1243708957089 is a deficient number, since it is larger than the sum of its proper divisors (795024234714).

1243708957089 is an frugal number, since it uses more digits than its factorization.

1243708957089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514 (or 254 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 63.

The spelling of 1243708957089 in words is "one trillion, two hundred forty-three billion, seven hundred eight million, nine hundred fifty-seven thousand, eighty-nine".