650551 has 4 divisors (see below), whose sum is σ = 709704. Its totient is φ = 591400.

The previous prime is 650549. The next prime is 650563. The reversal of 650551 is 155056.

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 650551 - 2¹ = 650549 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

650551 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650581) 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, 29560 + ... + 29581.

It is an arithmetic number, because the mean of its divisors is an integer number (177426).

2⁶⁵⁰⁵⁵¹ is an apocalyptic number.

650551 is a deficient number, since it is larger than the sum of its proper divisors (59153).

650551 is a wasteful number, since it uses less digits than its factorization.

650551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59152.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 650551 is about 806.5674181369. The cubic root of 650551 is about 86.6483804286.

It can be divided in two parts, 65055 and 1, that added together give a palindrome (65056).

The spelling of 650551 in words is "six hundred fifty thousand, five hundred fifty-one".