41561781 has 4 divisors (see below), whose sum is σ = 55415712. Its totient is φ = 27707852.

The previous prime is 41561777. The next prime is 41561813. The reversal of 41561781 is 18716514.

It is a happy number.

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 41561781 - 2² = 41561777 is a prime.

It is a super-2 number, since 2×41561781² = 3454763279783922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41561701) 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, 6926961 + ... + 6926966.

It is an arithmetic number, because the mean of its divisors is an integer number (13853928).

Almost surely, 2^41561781 is an apocalyptic number.

It is an amenable number.

41561781 is a deficient number, since it is larger than the sum of its proper divisors (13853931).

41561781 is a wasteful number, since it uses less digits than its factorization.

41561781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13853930.

The product of its digits is 6720, while the sum is 33.

The square root of 41561781 is about 6446.8427156244. The cubic root of 41561781 is about 346.3894981100.

The spelling of 41561781 in words is "forty-one million, five hundred sixty-one thousand, seven hundred eighty-one".