655554 has 16 divisors (see below), whose sum is σ = 1388448. Its totient is φ = 205632.

The previous prime is 655547. The next prime is 655559. The reversal of 655554 is 455556.

It is a Curzon number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (655559) by changing a digit.

655554 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 (5) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3112 + ... + 3315.

It is an arithmetic number, because the mean of its divisors is an integer number (86778).

2⁶⁵⁵⁵⁵⁴ is an apocalyptic number.

655554 is an abundant number, since it is smaller than the sum of its proper divisors (732894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

655554 is a wasteful number, since it uses less digits than its factorization.

655554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6449.

The product of its digits is 15000, while the sum is 30.

The square root of 655554 is about 809.6628928140. The cubic root of 655554 is about 86.8699338005.

The spelling of 655554 in words is "six hundred fifty-five thousand, five hundred fifty-four".