651266 has 16 divisors (see below), whose sum is σ = 1218240. Its totient is φ = 253680.

The previous prime is 651257. The next prime is 651271. The reversal of 651266 is 662156.

651266 = 166² + 167² + ... + 186².

It is an unprimeable number.

651266 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1961 + ... + 2268.

It is an arithmetic number, because the mean of its divisors is an integer number (76140).

2⁶⁵¹²⁶⁶ is an apocalyptic number.

651266 is a deficient number, since it is larger than the sum of its proper divisors (566974).

651266 is a wasteful number, since it uses less digits than its factorization.

651266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4249.

The product of its digits is 2160, while the sum is 26.

The square root of 651266 is about 807.0105327689. The cubic root of 651266 is about 86.6801129696.

It can be divided in two parts, 651 and 266, that multiplied together give a triangular number (173166 = T₅₈₈).

The spelling of 651266 in words is "six hundred fifty-one thousand, two hundred sixty-six".