253817561 has 8 divisors (see below), whose sum is σ = 268948800. Its totient is φ = 238863600.

The previous prime is 253817539. The next prime is 253817563. The reversal of 253817561 is 165718352.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253817561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (253817563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41366 + ... + 47103.

It is an arithmetic number, because the mean of its divisors is an integer number (33618600).

Almost surely, 2^253817561 is an apocalyptic number.

It is an amenable number.

253817561 is a deficient number, since it is larger than the sum of its proper divisors (15131239).

253817561 is a wasteful number, since it uses less digits than its factorization.

253817561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88639.

The product of its digits is 50400, while the sum is 38.

The square root of 253817561 is about 15931.6528018910. The cubic root of 253817561 is about 633.1508907242.

The spelling of 253817561 in words is "two hundred fifty-three million, eight hundred seventeen thousand, five hundred sixty-one".