1444635613 has 4 divisors (see below), whose sum is σ = 1445174748. Its totient is φ = 1444096480.

The previous prime is 1444635601. The next prime is 1444635631. The reversal of 1444635613 is 3165364441.

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 1010413369 + 434222244 = 31787^2 + 20838^2 .

It is a cyclic number.

It is not a de Polignac number, because 1444635613 - 2²⁵ = 1411081181 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 (1444633613) 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, 265528 + ... + 270913.

It is an arithmetic number, because the mean of its divisors is an integer number (361293687).

Almost surely, 2^1444635613 is an apocalyptic number.

It is an amenable number.

1444635613 is a deficient number, since it is larger than the sum of its proper divisors (539135).

1444635613 is an equidigital number, since it uses as much as digits as its factorization.

1444635613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539134.

The product of its digits is 103680, while the sum is 37.

The square root of 1444635613 is about 38008.3624088174. The cubic root of 1444635613 is about 1130.4536808300.

The spelling of 1444635613 in words is "one billion, four hundred forty-four million, six hundred thirty-five thousand, six hundred thirteen".