40255561 has 4 divisors (see below), whose sum is σ = 40317124. Its totient is φ = 40194000.

The previous prime is 40255549. The next prime is 40255583. The reversal of 40255561 is 16555204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11095561 + 29160000 = 3331^2 + 5400^2 .

It is a cyclic number.

It is not a de Polignac number, because 40255561 - 2⁹ = 40255049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40255531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29790 + ... + 31111.

It is an arithmetic number, because the mean of its divisors is an integer number (10079281).

Almost surely, 2^40255561 is an apocalyptic number.

It is an amenable number.

40255561 is a deficient number, since it is larger than the sum of its proper divisors (61563).

40255561 is an equidigital number, since it uses as much as digits as its factorization.

40255561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61562.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 40255561 is about 6344.7270232848. The cubic root of 40255561 is about 342.7219822980.

The spelling of 40255561 in words is "forty million, two hundred fifty-five thousand, five hundred sixty-one".