40505513 has 6 divisors (see below), whose sum is σ = 40765806. Its totient is φ = 40246272.

The previous prime is 40505477. The next prime is 40505519. The reversal of 40505513 is 31550504.

It can be written as a sum of positive squares in 3 ways, for example, as 24720784 + 15784729 = 4972^2 + 3973^2 .

It is not a de Polignac number, because 40505513 - 2⁶ = 40505449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40505519) 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, 101831 + ... + 102227.

It is an arithmetic number, because the mean of its divisors is an integer number (6794301).

Almost surely, 2^40505513 is an apocalyptic number.

It is an amenable number.

40505513 is a deficient number, since it is larger than the sum of its proper divisors (260293).

40505513 is an frugal number, since it uses more digits than its factorization.

40505513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 40505513 is about 6364.3941581269. The cubic root of 40505513 is about 343.4298543050.

The spelling of 40505513 in words is "forty million, five hundred five thousand, five hundred thirteen".