253540505 has 4 divisors (see below), whose sum is σ = 304248612. Its totient is φ = 202832400.

The previous prime is 253540493. The next prime is 253540561. The reversal of 253540505 is 505045352.

It is a happy number.

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 152497801 + 101042704 = 12349^2 + 10052^2 .

It is not a de Polignac number, because 253540505 - 2⁴ = 253540489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25354046 + ... + 25354055.

It is an arithmetic number, because the mean of its divisors is an integer number (76062153).

Almost surely, 2^253540505 is an apocalyptic number.

It is an amenable number.

253540505 is a deficient number, since it is larger than the sum of its proper divisors (50708107).

253540505 is an equidigital number, since it uses as much as digits as its factorization.

253540505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50708106.

The product of its (nonzero) digits is 15000, while the sum is 29.

The square root of 253540505 is about 15922.9552847454. The cubic root of 253540505 is about 632.9204337016.

Adding to 253540505 its reverse (505045352), we get a palindrome (758585857).

The spelling of 253540505 in words is "two hundred fifty-three million, five hundred forty thousand, five hundred five".