40971681 has 6 divisors (see below), whose sum is σ = 59181330. Its totient is φ = 27314448.

The previous prime is 40971673. The next prime is 40971701. The reversal of 40971681 is 18617904.

It can be written as a sum of positive squares in only one way, i.e., 40755456 + 216225 = 6384^2 + 465^2 .

It is not a de Polignac number, because 40971681 - 2³ = 40971673 is a prime.

It is a super-2 number, since 2×40971681² = 3357357287931522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40971641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2276196 + ... + 2276213.

It is an arithmetic number, because the mean of its divisors is an integer number (9863555).

Almost surely, 2^40971681 is an apocalyptic number.

It is an amenable number.

40971681 is a deficient number, since it is larger than the sum of its proper divisors (18209649).

40971681 is a wasteful number, since it uses less digits than its factorization.

40971681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4552415 (or 4552412 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 40971681 is about 6400.9125130719. The cubic root of 40971681 is about 344.7423154568.

It can be divided in two parts, 4097 and 1681, that added together give a triangular number (5778 = T₁₀₇).

The spelling of 40971681 in words is "forty million, nine hundred seventy-one thousand, six hundred eighty-one".