425638553 has 4 divisors (see below), whose sum is σ = 435537168. Its totient is φ = 415739940.

The previous prime is 425638547. The next prime is 425638573. The reversal of 425638553 is 355836524.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-425638553 is a prime.

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 425638553.

It is not an unprimeable number, because it can be changed into a prime (425638523) 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 3 ways as a sum of consecutive naturals, for example, 4949243 + ... + 4949328.

It is an arithmetic number, because the mean of its divisors is an integer number (108884292).

Almost surely, 2^425638553 is an apocalyptic number.

425638553 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

It is an amenable number.

425638553 is a deficient number, since it is larger than the sum of its proper divisors (9898615).

425638553 is an equidigital number, since it uses as much as digits as its factorization.

425638553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9898614.

The product of its digits is 432000, while the sum is 41.

The square root of 425638553 is about 20631.0095002644. The cubic root of 425638553 is about 752.2236542629.

The spelling of 425638553 in words is "four hundred twenty-five million, six hundred thirty-eight thousand, five hundred fifty-three".