40061681 has 8 divisors (see below), whose sum is σ = 44720544. Its totient is φ = 35572320.

The previous prime is 40061663. The next prime is 40061683. The reversal of 40061681 is 18616004.

40061681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40061681 - 2¹⁸ = 39799537 is a prime.

It is a super-2 number, since 2×40061681² = 3209876569091522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40061681.

It is not an unprimeable number, because it can be changed into a prime (40061683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41876 + ... + 42821.

It is an arithmetic number, because the mean of its divisors is an integer number (5590068).

Almost surely, 2^40061681 is an apocalyptic number.

It is an amenable number.

40061681 is a deficient number, since it is larger than the sum of its proper divisors (4658863).

40061681 is a wasteful number, since it uses less digits than its factorization.

40061681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84751.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 40061681 is about 6329.4297531452. The cubic root of 40061681 is about 342.1708874333.

Adding to 40061681 its reverse (18616004), we get a palindrome (58677685).

The spelling of 40061681 in words is "forty million, sixty-one thousand, six hundred eighty-one".