40643131 has 4 divisors (see below), whose sum is σ = 41741632. Its totient is φ = 39544632.

The previous prime is 40643129. The next prime is 40643137. The reversal of 40643131 is 13134604.

40643131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40643131 - 2¹ = 40643129 is a prime.

It is a super-2 number, since 2×40643131² = 3303728194966322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40643137) 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 3 ways as a sum of consecutive naturals, for example, 549195 + ... + 549268.

It is an arithmetic number, because the mean of its divisors is an integer number (10435408).

Almost surely, 2^40643131 is an apocalyptic number.

40643131 is a deficient number, since it is larger than the sum of its proper divisors (1098501).

40643131 is a wasteful number, since it uses less digits than its factorization.

40643131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098500.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 40643131 is about 6375.1965459898. The cubic root of 40643131 is about 343.8183504415.

Adding to 40643131 its reverse (13134604), we get a palindrome (53777735).

The spelling of 40643131 in words is "forty million, six hundred forty-three thousand, one hundred thirty-one".