40511813 has 4 divisors (see below), whose sum is σ = 41499948. Its totient is φ = 39523680.

The previous prime is 40511803. The next prime is 40511831. The reversal of 40511813 is 31811504.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19918369 + 20593444 = 4463^2 + 4538^2 .

It is a cyclic number.

It is not a de Polignac number, because 40511813 - 2⁶ = 40511749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40511803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494006 + ... + 494087.

It is an arithmetic number, because the mean of its divisors is an integer number (10374987).

Almost surely, 2^40511813 is an apocalyptic number.

It is an amenable number.

40511813 is a deficient number, since it is larger than the sum of its proper divisors (988135).

40511813 is an equidigital number, since it uses as much as digits as its factorization.

40511813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988134.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 40511813 is about 6364.8890799448. The cubic root of 40511813 is about 343.4476584322.

The spelling of 40511813 in words is "forty million, five hundred eleven thousand, eight hundred thirteen".