41531561 has 4 divisors (see below), whose sum is σ = 43974612. Its totient is φ = 39088512.

The previous prime is 41531531. The next prime is 41531569. The reversal of 41531561 is 16513514.

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 38987536 + 2544025 = 6244^2 + 1595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-41531561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 41531561.

It is not an unprimeable number, because it can be changed into a prime (41531569) 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, 1221500 + ... + 1221533.

It is an arithmetic number, because the mean of its divisors is an integer number (10993653).

Almost surely, 2^41531561 is an apocalyptic number.

It is an amenable number.

41531561 is a deficient number, since it is larger than the sum of its proper divisors (2443051).

41531561 is a wasteful number, since it uses less digits than its factorization.

41531561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443050.

The product of its digits is 1800, while the sum is 26.

The square root of 41531561 is about 6444.4985064782. The cubic root of 41531561 is about 346.3055232938.

The spelling of 41531561 in words is "forty-one million, five hundred thirty-one thousand, five hundred sixty-one".