41561509 has 4 divisors (see below), whose sum is σ = 45339840. Its totient is φ = 37783180.

The previous prime is 41561501. The next prime is 41561537. The reversal of 41561509 is 90516514.

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 41561509 - 2³ = 41561501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41561501) 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, 1889149 + ... + 1889170.

It is an arithmetic number, because the mean of its divisors is an integer number (11334960).

Almost surely, 2^41561509 is an apocalyptic number.

It is an amenable number.

41561509 is a deficient number, since it is larger than the sum of its proper divisors (3778331).

41561509 is a wasteful number, since it uses less digits than its factorization.

41561509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3778330.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 41561509 is about 6446.8216199923. The cubic root of 41561509 is about 346.3887424626.

It can be divided in two parts, 4156 and 1509, that added together give a palindrome (5665).

The spelling of 41561509 in words is "forty-one million, five hundred sixty-one thousand, five hundred nine".