40505131 has 4 divisors (see below), whose sum is σ = 42637000. Its totient is φ = 38373264.

The previous prime is 40505123. The next prime is 40505137. The reversal of 40505131 is 13150504.

40505131 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 40505131 - 2³ = 40505123 is a prime.

It is a super-2 number, since 2×40505131² = 3281331274654322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 2131849 = 40505131 / (4 + 0 + 5 + 0 + 5 + 1 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40505099 and 40505108.

It is not an unprimeable number, because it can be changed into a prime (40505137) 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, 1065906 + ... + 1065943.

It is an arithmetic number, because the mean of its divisors is an integer number (10659250).

Almost surely, 2^40505131 is an apocalyptic number.

40505131 is a deficient number, since it is larger than the sum of its proper divisors (2131869).

40505131 is a wasteful number, since it uses less digits than its factorization.

40505131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131868.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 40505131 is about 6364.3641473442. The cubic root of 40505131 is about 343.4287746938.

Adding to 40505131 its reverse (13150504), we get a palindrome (53655635).

The spelling of 40505131 in words is "forty million, five hundred five thousand, one hundred thirty-one".