1239554902609 has 9 divisors (see below), whose sum is σ = 1241970005577. Its totient is φ = 1237144493364.

The previous prime is 1239554902577. The next prime is 1239554902613. The reversal of 1239554902609 is 9062094559321.

The square root of 1239554902609 is 1113353.

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

It is not a de Polignac number, because 1239554902609 - 2⁵ = 1239554902577 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1239554902609.

It is not an unprimeable number, because it can be changed into a prime (1239554902679) 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, 934102504 + ... + 934103830.

Almost surely, 2^{1239554902609} is an apocalyptic number.

1239554902609 is the 1113353-rd square number.

1239554902609 is the 556677-th centered octagonal number.

It is an amenable number.

1239554902609 is a deficient number, since it is larger than the sum of its proper divisors (2415102968).

1239554902609 is an frugal number, since it uses more digits than its factorization.

1239554902609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4332 (or 2166 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 55.

It can be divided in two parts, 123955 and 4902609, that added together give a square (5026564 = 2242²).

The spelling of 1239554902609 in words is "one trillion, two hundred thirty-nine billion, five hundred fifty-four million, nine hundred two thousand, six hundred nine".