40240250581 has 4 divisors (see below), whose sum is σ = 40240651852. Its totient is φ = 40239849312.

The previous prime is 40240250549. The next prime is 40240250597. The reversal of 40240250581 is 18505204204.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13005349681 + 27234900900 = 114041^2 + 165030^2 .

It is a cyclic number.

It is not a de Polignac number, because 40240250581 - 2⁵ = 40240250549 is a prime.

It is a super-3 number, since 3×40240250581³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40240250681) 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, 94675 + ... + 299071.

It is an arithmetic number, because the mean of its divisors is an integer number (10060162963).

Almost surely, 2^40240250581 is an apocalyptic number.

It is an amenable number.

40240250581 is a deficient number, since it is larger than the sum of its proper divisors (401271).

40240250581 is a wasteful number, since it uses less digits than its factorization.

40240250581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401270.

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 40240250581 its reverse (18505204204), we get a palindrome (58745454785).

The spelling of 40240250581 in words is "forty billion, two hundred forty million, two hundred fifty thousand, five hundred eighty-one".