255440173 has 2 divisors, whose sum is σ = 255440174. Its totient is φ = 255440172.

The previous prime is 255440131. The next prime is 255440177. The reversal of 255440173 is 371044552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189943524 + 65496649 = 13782^2 + 8093^2 .

It is a cyclic number.

It is not a de Polignac number, because 255440173 - 2⁹ = 255439661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255440177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127720086 + 127720087.

It is an arithmetic number, because the mean of its divisors is an integer number (127720087).

Almost surely, 2^255440173 is an apocalyptic number.

It is an amenable number.

255440173 is a deficient number, since it is larger than the sum of its proper divisors (1).

255440173 is an equidigital number, since it uses as much as digits as its factorization.

255440173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 255440173 is about 15982.4958313775. The cubic root of 255440173 is about 634.4972340450.

The spelling of 255440173 in words is "two hundred fifty-five million, four hundred forty thousand, one hundred seventy-three".