1247129105 has 4 divisors (see below), whose sum is σ = 1496554932. Its totient is φ = 997703280.

The previous prime is 1247129063. The next prime is 1247129119. The reversal of 1247129105 is 5019217421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 346108816 + 901020289 = 18604^2 + 30017^2 .

It is not a de Polignac number, because 1247129105 - 2¹⁴ = 1247112721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124712906 + ... + 124712915.

It is an arithmetic number, because the mean of its divisors is an integer number (374138733).

Almost surely, 2^1247129105 is an apocalyptic number.

It is an amenable number.

1247129105 is a deficient number, since it is larger than the sum of its proper divisors (249425827).

1247129105 is an equidigital number, since it uses as much as digits as its factorization.

1247129105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249425826.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 1247129105 is about 35314.7151340627. The cubic root of 1247129105 is about 1076.3920254143.

The spelling of 1247129105 in words is "one billion, two hundred forty-seven million, one hundred twenty-nine thousand, one hundred five".