40553521 has 4 divisors (see below), whose sum is σ = 40568832. Its totient is φ = 40538212.

The previous prime is 40553519. The next prime is 40553563. The reversal of 40553521 is 12535504.

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 not a de Polignac number, because 40553521 - 2¹ = 40553519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40553021) 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, 2545 + ... + 9358.

It is an arithmetic number, because the mean of its divisors is an integer number (10142208).

Almost surely, 2^40553521 is an apocalyptic number.

It is an amenable number.

40553521 is a deficient number, since it is larger than the sum of its proper divisors (15311).

40553521 is a wasteful number, since it uses less digits than its factorization.

40553521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15310.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 40553521 is about 6368.1646492533. The cubic root of 40553521 is about 343.5654808718.

The spelling of 40553521 in words is "forty million, five hundred fifty-three thousand, five hundred twenty-one".