651506 has 4 divisors (see below), whose sum is σ = 977262. Its totient is φ = 325752.

The previous prime is 651503. The next prime is 651509. The reversal of 651506 is 605156.

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 (651503) and next prime (651509).

It can be written as a sum of positive squares in only one way, i.e., 648025 + 3481 = 805^2 + 59^2 .

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 651506.

It is not an unprimeable number, because it can be changed into a prime (651503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162875 + ... + 162878.

2⁶⁵¹⁵⁰⁶ is an apocalyptic number.

651506 is a deficient number, since it is larger than the sum of its proper divisors (325756).

651506 is a wasteful number, since it uses less digits than its factorization.

651506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325755.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 651506 is about 807.1592160163. The cubic root of 651506 is about 86.6907592453.

It can be divided in two parts, 65150 and 6, that added together give a palindrome (65156).

The spelling of 651506 in words is "six hundred fifty-one thousand, five hundred six".