253585561 has 4 divisors (see below), whose sum is σ = 254188324. Its totient is φ = 252982800.

The previous prime is 253585547. The next prime is 253585567. The reversal of 253585561 is 165585352.

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 21206025 + 232379536 = 4605^2 + 15244^2 .

It is a cyclic number.

It is not a de Polignac number, because 253585561 - 2⁵ = 253585529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253585567) 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, 300750 + ... + 301591.

It is an arithmetic number, because the mean of its divisors is an integer number (63547081).

Almost surely, 2^253585561 is an apocalyptic number.

It is an amenable number.

253585561 is a deficient number, since it is larger than the sum of its proper divisors (602763).

253585561 is an equidigital number, since it uses as much as digits as its factorization.

253585561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602762.

The product of its digits is 180000, while the sum is 40.

The square root of 253585561 is about 15924.3700346356. The cubic root of 253585561 is about 632.9579230092.

The spelling of 253585561 in words is "two hundred fifty-three million, five hundred eighty-five thousand, five hundred sixty-one".