253581561 has 12 divisors (see below), whose sum is σ = 366669888. Its totient is φ = 168876504.

The previous prime is 253581553. The next prime is 253581563. The reversal of 253581561 is 165185352.

It is a happy number.

253581561 is a `hidden beast` number, since 25 + 3 + 581 + 56 + 1 = 666.

It is not a de Polignac number, because 253581561 - 2³ = 253581553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (253581563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5485 + ... + 23178.

It is an arithmetic number, because the mean of its divisors is an integer number (30555824).

Almost surely, 2^253581561 is an apocalyptic number.

It is an amenable number.

253581561 is a deficient number, since it is larger than the sum of its proper divisors (113088327).

253581561 is a wasteful number, since it uses less digits than its factorization.

253581561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29652 (or 29649 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 253581561 is about 15924.2444404750. The cubic root of 253581561 is about 632.9545949478.

The spelling of 253581561 in words is "two hundred fifty-three million, five hundred eighty-one thousand, five hundred sixty-one".