685561053 has 4 divisors (see below), whose sum is σ = 914081408. Its totient is φ = 457040700.

The previous prime is 685561043. The next prime is 685561087. The reversal of 685561053 is 350165586.

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 not a de Polignac number, because 685561053 - 2⁸ = 685560797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685561043) 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, 114260173 + ... + 114260178.

It is an arithmetic number, because the mean of its divisors is an integer number (228520352).

Almost surely, 2^685561053 is an apocalyptic number.

It is an amenable number.

685561053 is a deficient number, since it is larger than the sum of its proper divisors (228520355).

685561053 is a wasteful number, since it uses less digits than its factorization.

685561053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228520354.

The product of its (nonzero) digits is 108000, while the sum is 39.

The square root of 685561053 is about 26183.2208293785. The cubic root of 685561053 is about 881.7565864354.

The spelling of 685561053 in words is "six hundred eighty-five million, five hundred sixty-one thousand, fifty-three".