253591643 has 4 divisors (see below), whose sum is σ = 256647048. Its totient is φ = 250536240.

The previous prime is 253591633. The next prime is 253591691. The reversal of 253591643 is 346195352.

253591643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 253591643 - 2¹⁰ = 253590619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 253591597 and 253591606.

It is not an unprimeable number, because it can be changed into a prime (253591603) 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, 1527578 + ... + 1527743.

It is an arithmetic number, because the mean of its divisors is an integer number (64161762).

Almost surely, 2^253591643 is an apocalyptic number.

253591643 is a deficient number, since it is larger than the sum of its proper divisors (3055405).

253591643 is an equidigital number, since it uses as much as digits as its factorization.

253591643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3055404.

The product of its digits is 97200, while the sum is 38.

The square root of 253591643 is about 15924.5609986586. The cubic root of 253591643 is about 632.9629832596.

The spelling of 253591643 in words is "two hundred fifty-three million, five hundred ninety-one thousand, six hundred forty-three".