40525581 has 4 divisors (see below), whose sum is σ = 54034112. Its totient is φ = 27017052.

The previous prime is 40525579. The next prime is 40525607. The reversal of 40525581 is 18552504.

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 not a de Polignac number, because 40525581 - 2¹ = 40525579 is a prime.

It is a super-2 number, since 2×40525581² = 3284645430775122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40525571) 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, 6754261 + ... + 6754266.

It is an arithmetic number, because the mean of its divisors is an integer number (13508528).

Almost surely, 2^40525581 is an apocalyptic number.

It is an amenable number.

40525581 is a deficient number, since it is larger than the sum of its proper divisors (13508531).

40525581 is a wasteful number, since it uses less digits than its factorization.

40525581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13508530.

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 40525581 is about 6365.9705465860. The cubic root of 40525581 is about 343.4865610916.

The spelling of 40525581 in words is "forty million, five hundred twenty-five thousand, five hundred eighty-one".