285385553 has 2 divisors, whose sum is σ = 285385554. Its totient is φ = 285385552.

The previous prime is 285385519. The next prime is 285385577. The reversal of 285385553 is 355583582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217356049 + 68029504 = 14743^2 + 8248^2 .

It is a cyclic number.

It is not a de Polignac number, because 285385553 - 2¹⁴ = 285369169 is a prime.

It is a super-2 number, since 2×285385553² = 162889827722231618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (285385253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142692776 + 142692777.

It is an arithmetic number, because the mean of its divisors is an integer number (142692777).

Almost surely, 2^285385553 is an apocalyptic number.

It is an amenable number.

285385553 is a deficient number, since it is larger than the sum of its proper divisors (1).

285385553 is an equidigital number, since it uses as much as digits as its factorization.

285385553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720000, while the sum is 44.

The square root of 285385553 is about 16893.3582510997. The cubic root of 285385553 is about 658.3810588627.

The spelling of 285385553 in words is "two hundred eighty-five million, three hundred eighty-five thousand, five hundred fifty-three".