656749 has 2 divisors, whose sum is σ = 656750. Its totient is φ = 656748.

The previous prime is 656741. The next prime is 656753. The reversal of 656749 is 947656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 562500 + 94249 = 750^2 + 307^2 .

It is a cyclic number.

It is not a de Polignac number, because 656749 - 2³ = 656741 is a prime.

It is an alternating number because its digits alternate between even and odd.

656749 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328374 + 328375.

It is an arithmetic number, because the mean of its divisors is an integer number (328375).

2⁶⁵⁶⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

656749 is a deficient number, since it is larger than the sum of its proper divisors (1).

656749 is an equidigital number, since it uses as much as digits as its factorization.

656749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 37.

The square root of 656749 is about 810.4005182624. The cubic root of 656749 is about 86.9226864123.

The spelling of 656749 in words is "six hundred fifty-six thousand, seven hundred forty-nine".