40603561 has 4 divisors (see below), whose sum is σ = 40621824. Its totient is φ = 40585300.

The previous prime is 40603559. The next prime is 40603573. The reversal of 40603561 is 16530604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40603561 - 2¹ = 40603559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40603501) 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, 5245 + ... + 10426.

It is an arithmetic number, because the mean of its divisors is an integer number (10155456).

Almost surely, 2^40603561 is an apocalyptic number.

It is an amenable number.

40603561 is a deficient number, since it is larger than the sum of its proper divisors (18263).

40603561 is a wasteful number, since it uses less digits than its factorization.

40603561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18262.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 40603561 is about 6372.0923565184. The cubic root of 40603561 is about 343.7067341248.

The spelling of 40603561 in words is "forty million, six hundred three thousand, five hundred sixty-one".