1308729136009 has 9 divisors (see below), whose sum is σ = 1368131877133. Its totient is φ = 1251802701292.

The previous prime is 1308729135983. The next prime is 1308729136027. The reversal of 1308729136009 is 9006319278031.

The square root of 1308729136009 is 1143997.

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

It is not a de Polignac number, because 1308729136009 - 2⁵ = 1308729135977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1308729136069) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26287062 + ... + 26336800.

Almost surely, 2^{1308729136009} is an apocalyptic number.

1308729136009 is the 1143997-th square number.

1308729136009 is the 571999-th centered octagonal number.

It is an amenable number.

1308729136009 is a deficient number, since it is larger than the sum of its proper divisors (59402741124).

1308729136009 is an frugal number, since it uses more digits than its factorization.

1308729136009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99524 (or 49762 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 49.

Multiplying 1308729136009 by its sum of digits (49), we get a square (64127727664441 = 8007979²).

The spelling of 1308729136009 in words is "one trillion, three hundred eight billion, seven hundred twenty-nine million, one hundred thirty-six thousand, nine".