40011521 has 4 divisors (see below), whose sum is σ = 43648944. Its totient is φ = 36374100.

The previous prime is 40011509. The next prime is 40011539. The reversal of 40011521 is 12511004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40011521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40011496 and 40011505.

It is not an unprimeable number, because it can be changed into a prime (40011551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1818695 + ... + 1818716.

It is an arithmetic number, because the mean of its divisors is an integer number (10912236).

Almost surely, 2^40011521 is an apocalyptic number.

It is an amenable number.

40011521 is a deficient number, since it is larger than the sum of its proper divisors (3637423).

40011521 is a wasteful number, since it uses less digits than its factorization.

40011521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3637422.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 40011521 is about 6325.4660697849. The cubic root of 40011521 is about 342.0280205716.

Adding to 40011521 its reverse (12511004), we get a palindrome (52522525).

The spelling of 40011521 in words is "forty million, eleven thousand, five hundred twenty-one".