653251 has 4 divisors (see below), whose sum is σ = 661600. Its totient is φ = 644904.

The previous prime is 653243. The next prime is 653267. The reversal of 653251 is 152356.

It is a happy number.

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 653251 - 2³ = 653243 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (653281) 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, 4056 + ... + 4213.

It is an arithmetic number, because the mean of its divisors is an integer number (165400).

2⁶⁵³²⁵¹ is an apocalyptic number.

653251 is a deficient number, since it is larger than the sum of its proper divisors (8349).

653251 is an equidigital number, since it uses as much as digits as its factorization.

653251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8348.

The product of its digits is 900, while the sum is 22.

The square root of 653251 is about 808.2394447192. The cubic root of 653251 is about 86.7680880375.

The spelling of 653251 in words is "six hundred fifty-three thousand, two hundred fifty-one".