41781621 has 16 divisors (see below), whose sum is σ = 65389184. Its totient is φ = 23229504.

The previous prime is 41781613. The next prime is 41781629. The reversal of 41781621 is 12618714.

It is an interprime number because it is at equal distance from previous prime (41781613) and next prime (41781629).

It is not a de Polignac number, because 41781621 - 2³ = 41781613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41781629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26110 + ... + 27663.

It is an arithmetic number, because the mean of its divisors is an integer number (4086824).

Almost surely, 2^41781621 is an apocalyptic number.

It is an amenable number.

41781621 is a deficient number, since it is larger than the sum of its proper divisors (23607563).

41781621 is a wasteful number, since it uses less digits than its factorization.

41781621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53820.

The product of its digits is 2688, while the sum is 30.

The square root of 41781621 is about 6463.8704349639. The cubic root of 41781621 is about 346.9991639586. Note that the first 3 decimals are identical.

The spelling of 41781621 in words is "forty-one million, seven hundred eighty-one thousand, six hundred twenty-one".