355643561 has 16 divisors (see below), whose sum is σ = 441176064. Its totient is φ = 279163584.

The previous prime is 355643531. The next prime is 355643569. The reversal of 355643561 is 165346553.

It is not a de Polignac number, because 355643561 - 2¹⁸ = 355381417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (355643569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3830 + ... + 26943.

It is an arithmetic number, because the mean of its divisors is an integer number (27573504).

Almost surely, 2^355643561 is an apocalyptic number.

It is an amenable number.

355643561 is a deficient number, since it is larger than the sum of its proper divisors (85532503).

355643561 is a wasteful number, since it uses less digits than its factorization.

355643561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30920.

The product of its digits is 162000, while the sum is 38.

The square root of 355643561 is about 18858.5142840045. The cubic root of 355643561 is about 708.4974911373.

It can be divided in two parts, 3556 and 43561, that multiplied together give a square (154902916 = 12446²).

The spelling of 355643561 in words is "three hundred fifty-five million, six hundred forty-three thousand, five hundred sixty-one".