253405105 has 4 divisors (see below), whose sum is σ = 304086132. Its totient is φ = 202724080.

The previous prime is 253405073. The next prime is 253405121. The reversal of 253405105 is 501504352.

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 106316721 + 147088384 = 10311^2 + 12128^2 .

It is not a de Polignac number, because 253405105 - 2⁵ = 253405073 is a prime.

It is a super-2 number, since 2×253405105² = 128428294480122050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 253405105.

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, 25340506 + ... + 25340515.

It is an arithmetic number, because the mean of its divisors is an integer number (76021533).

Almost surely, 2^253405105 is an apocalyptic number.

It is an amenable number.

253405105 is a deficient number, since it is larger than the sum of its proper divisors (50681027).

253405105 is an equidigital number, since it uses as much as digits as its factorization.

253405105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50681026.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 253405105 is about 15918.7029936487. The cubic root of 253405105 is about 632.8077460050.

Adding to 253405105 its reverse (501504352), we get a palindrome (754909457).

The spelling of 253405105 in words is "two hundred fifty-three million, four hundred five thousand, one hundred five".