1299054805 has 4 divisors (see below), whose sum is σ = 1558865772. Its totient is φ = 1039243840.

The previous prime is 1299054803. The next prime is 1299054817. The reversal of 1299054805 is 5084509921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5084509921 = 7229 ⋅703349.

It can be written as a sum of positive squares in 2 ways, for example, as 478690641 + 820364164 = 21879^2 + 28642^2 .

It is not a de Polignac number, because 1299054805 - 2¹ = 1299054803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299054803) 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, 129905476 + ... + 129905485.

It is an arithmetic number, because the mean of its divisors is an integer number (389716443).

Almost surely, 2^1299054805 is an apocalyptic number.

It is an amenable number.

1299054805 is a deficient number, since it is larger than the sum of its proper divisors (259810967).

1299054805 is an equidigital number, since it uses as much as digits as its factorization.

1299054805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259810966.

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 1299054805 is about 36042.4028749472. The cubic root of 1299054805 is about 1091.1283114692.

The spelling of 1299054805 in words is "one billion, two hundred ninety-nine million, fifty-four thousand, eight hundred five".