40133521 has 4 divisors (see below), whose sum is σ = 40206132. Its totient is φ = 40060912.

The previous prime is 40133507. The next prime is 40133539. The reversal of 40133521 is 12533104.

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 3651921 + 36481600 = 1911^2 + 6040^2 .

It is a cyclic number.

It is not a de Polignac number, because 40133521 - 2¹³ = 40125329 is a prime.

It is a super-2 number, since 2×40133521² = 3221399015714882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40133581) 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, 35470 + ... + 36583.

It is an arithmetic number, because the mean of its divisors is an integer number (10051533).

Almost surely, 2^40133521 is an apocalyptic number.

It is an amenable number.

40133521 is a deficient number, since it is larger than the sum of its proper divisors (72611).

40133521 is an equidigital number, since it uses as much as digits as its factorization.

40133521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72610.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 40133521 is about 6335.1022880456. The cubic root of 40133521 is about 342.3752962104.

Adding to 40133521 its reverse (12533104), we get a palindrome (52666625).

The spelling of 40133521 in words is "forty million, one hundred thirty-three thousand, five hundred twenty-one".