1253104865 has 4 divisors (see below), whose sum is σ = 1503725844. Its totient is φ = 1002483888.

The previous prime is 1253104861. The next prime is 1253104871. The reversal of 1253104865 is 5684013521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5684013521 = 439 ⋅12947639.

It can be written as a sum of positive squares in 2 ways, for example, as 280663009 + 972441856 = 16753^2 + 31184^2 .

It is a cyclic number.

It is not a de Polignac number, because 1253104865 - 2² = 1253104861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1253104861) 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, 125310482 + ... + 125310491.

It is an arithmetic number, because the mean of its divisors is an integer number (375931461).

Almost surely, 2^1253104865 is an apocalyptic number.

It is an amenable number.

1253104865 is a deficient number, since it is larger than the sum of its proper divisors (250620979).

1253104865 is an equidigital number, since it uses as much as digits as its factorization.

1253104865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250620978.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 1253104865 is about 35399.2212484964. The cubic root of 1253104865 is about 1078.1085047564.

The spelling of 1253104865 in words is "one billion, two hundred fifty-three million, one hundred four thousand, eight hundred sixty-five".