1239154127929 has 3 divisors (see below), whose sum is σ = 1239155241103. Its totient is φ = 1239153014756.

The previous prime is 1239154127857. The next prime is 1239154127941. The reversal of 1239154127929 is 9297214519321.

The square root of 1239154127929 is 1113173.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 573056570025 + 666097557904 = 757005^2 + 816148^2 .

It is not a de Polignac number, because 1239154127929 - 2¹⁹ = 1239153603641 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 1239154127929.

It is not an unprimeable number, because it can be changed into a prime (1239152127929) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 556587 + ... + 1669759.

Almost surely, 2^{1239154127929} is an apocalyptic number.

1239154127929 is the 1113173-rd square number.

1239154127929 is the 556587-th centered octagonal number.

It is an amenable number.

1239154127929 is a deficient number, since it is larger than the sum of its proper divisors (1113174).

1239154127929 is an frugal number, since it uses more digits than its factorization.

1239154127929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226346 (or 1113173 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 55.

It can be divided in two parts, 123915 and 4127929, that added together give a square (4251844 = 2062²).

The spelling of 1239154127929 in words is "one trillion, two hundred thirty-nine billion, one hundred fifty-four million, one hundred twenty-seven thousand, nine hundred twenty-nine".