653911 has 4 divisors (see below), whose sum is σ = 667872. Its totient is φ = 639952.

The previous prime is 653903. The next prime is 653927. The reversal of 653911 is 119356.

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

It is not a de Polignac number, because 653911 - 2³ = 653903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653941) 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, 6910 + ... + 7003.

It is an arithmetic number, because the mean of its divisors is an integer number (166968).

2⁶⁵³⁹¹¹ is an apocalyptic number.

653911 is a deficient number, since it is larger than the sum of its proper divisors (13961).

653911 is a wasteful number, since it uses less digits than its factorization.

653911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13960.

The product of its digits is 810, while the sum is 25.

The square root of 653911 is about 808.6476364895. The cubic root of 653911 is about 86.7972997100.

The spelling of 653911 in words is "six hundred fifty-three thousand, nine hundred eleven".