651956 has 6 divisors (see below), whose sum is σ = 1140930. Its totient is φ = 325976.

The previous prime is 651943. The next prime is 651971. The reversal of 651956 is 659156.

It can be written as a sum of positive squares in only one way, i.e., 401956 + 250000 = 634^2 + 500^2 .

It is a congruent number.

It is an unprimeable number.

651956 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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81491 + ... + 81498.

It is an arithmetic number, because the mean of its divisors is an integer number (190155).

2⁶⁵¹⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

651956 is a deficient number, since it is larger than the sum of its proper divisors (488974).

651956 is a wasteful number, since it uses less digits than its factorization.

651956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162993 (or 162991 counting only the distinct ones).

The product of its digits is 8100, while the sum is 32.

The square root of 651956 is about 807.4379233105. The cubic root of 651956 is about 86.7107139674.

It can be divided in two parts, 65195 and 6, that multiplied together give a triangular number (391170 = T₈₈₄).

The spelling of 651956 in words is "six hundred fifty-one thousand, nine hundred fifty-six".