651243 has 4 divisors (see below), whose sum is σ = 868328. Its totient is φ = 434160.

The previous prime is 651239. The next prime is 651247. The reversal of 651243 is 342156.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (651239) and next prime (651247).

It is not a de Polignac number, because 651243 - 2² = 651239 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651247) 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, 108538 + ... + 108543.

It is an arithmetic number, because the mean of its divisors is an integer number (217082).

2⁶⁵¹²⁴³ is an apocalyptic number.

651243 is a deficient number, since it is larger than the sum of its proper divisors (217085).

651243 is a wasteful number, since it uses less digits than its factorization.

651243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217084.

The product of its digits is 720, while the sum is 21.

The square root of 651243 is about 806.9962825193. The cubic root of 651243 is about 86.6790925642.

Adding to 651243 its reverse (342156), we get a palindrome (993399).

It can be divided in two parts, 6512 and 43, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 651243 in words is "six hundred fifty-one thousand, two hundred forty-three".