653551 has 4 divisors (see below), whose sum is σ = 656352. Its totient is φ = 650752.

The previous prime is 653539. The next prime is 653561. The reversal of 653551 is 155356.

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 653551 - 2⁵ = 653519 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 (653501) 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, 1015 + ... + 1528.

It is an arithmetic number, because the mean of its divisors is an integer number (164088).

2⁶⁵³⁵⁵¹ is an apocalyptic number.

653551 is a deficient number, since it is larger than the sum of its proper divisors (2801).

653551 is a wasteful number, since it uses less digits than its factorization.

653551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2800.

The product of its digits is 2250, while the sum is 25.

The square root of 653551 is about 808.4250119832. The cubic root of 653551 is about 86.7813685084.

It can be divided in two parts, 65355 and 1, that added together give a palindrome (65356).

The spelling of 653551 in words is "six hundred fifty-three thousand, five hundred fifty-one".