684271553 has 4 divisors (see below), whose sum is σ = 782024640. Its totient is φ = 586518468.

The previous prime is 684271537. The next prime is 684271561. The reversal of 684271553 is 355172486.

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 not a de Polignac number, because 684271553 - 2⁴ = 684271537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 684271553.

It is not an unprimeable number, because it can be changed into a prime (684271583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48876533 + ... + 48876546.

It is an arithmetic number, because the mean of its divisors is an integer number (195506160).

Almost surely, 2^684271553 is an apocalyptic number.

It is an amenable number.

684271553 is a deficient number, since it is larger than the sum of its proper divisors (97753087).

684271553 is an equidigital number, since it uses as much as digits as its factorization.

684271553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97753086.

The product of its digits is 201600, while the sum is 41.

The square root of 684271553 is about 26158.5846903077. The cubic root of 684271553 is about 881.2033953658.

The spelling of 684271553 in words is "six hundred eighty-four million, two hundred seventy-one thousand, five hundred fifty-three".