1299294261805 has 4 divisors (see below), whose sum is σ = 1559153114172. Its totient is φ = 1039435409440.

The previous prime is 1299294261799. The next prime is 1299294261809. The reversal of 1299294261805 is 5081624929921.

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 783214380036 + 516079881769 = 884994^2 + 718387^2 .

It is not a de Polignac number, because 1299294261805 - 2⁷ = 1299294261677 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 1299294261805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299294261809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129929426176 + ... + 129929426185.

It is an arithmetic number, because the mean of its divisors is an integer number (389788278543).

Almost surely, 2^{1299294261805} is an apocalyptic number.

It is an amenable number.

1299294261805 is a deficient number, since it is larger than the sum of its proper divisors (259858852367).

1299294261805 is an equidigital number, since it uses as much as digits as its factorization.

1299294261805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259858852366.

The product of its (nonzero) digits is 5598720, while the sum is 58.

The spelling of 1299294261805 in words is "one trillion, two hundred ninety-nine billion, two hundred ninety-four million, two hundred sixty-one thousand, eight hundred five".