656149 has 8 divisors (see below), whose sum is σ = 748440. Its totient is φ = 569856.

The previous prime is 656147. The next prime is 656153. The reversal of 656149 is 941656.

It can be written as a sum of positive squares in 4 ways, for example, as 49 + 656100 = 7^2 + 810^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 656149 - 2¹ = 656147 is a prime.

It is an Ulam number.

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

It is a Duffinian number.

656149 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 656149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656141) by changing a digit.

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, 1264 + ... + 1705.

It is an arithmetic number, because the mean of its divisors is an integer number (93555).

2⁶⁵⁶¹⁴⁹ is an apocalyptic number.

It is an amenable number.

656149 is a deficient number, since it is larger than the sum of its proper divisors (92291).

656149 is a wasteful number, since it uses less digits than its factorization.

656149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2999.

The product of its digits is 6480, while the sum is 31.

The square root of 656149 is about 810.0302463489. The cubic root of 656149 is about 86.8962077513.

It can be divided in two parts, 6561 and 49, that multiplied together give a square (321489 = 567²).

The spelling of 656149 in words is "six hundred fifty-six thousand, one hundred forty-nine".