1253775641 has 4 divisors (see below), whose sum is σ = 1253911332. Its totient is φ = 1253639952.

The previous prime is 1253775617. The next prime is 1253775683. The reversal of 1253775641 is 1465773521.

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 424566025 + 829209616 = 20605^2 + 28796^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1253775641 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 (1253775541) 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, 52886 + ... + 72831.

It is an arithmetic number, because the mean of its divisors is an integer number (313477833).

Almost surely, 2^1253775641 is an apocalyptic number.

It is an amenable number.

1253775641 is a deficient number, since it is larger than the sum of its proper divisors (135691).

1253775641 is an equidigital number, since it uses as much as digits as its factorization.

1253775641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135690.

The product of its digits is 176400, while the sum is 41.

The square root of 1253775641 is about 35408.6944266518. The cubic root of 1253775641 is about 1078.3008377722.

The spelling of 1253775641 in words is "one billion, two hundred fifty-three million, seven hundred seventy-five thousand, six hundred forty-one".