40226581 has 2 divisors, whose sum is σ = 40226582. Its totient is φ = 40226580.

The previous prime is 40226513. The next prime is 40226587. The reversal of 40226581 is 18562204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20566225 + 19660356 = 4535^2 + 4434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40226581 is a prime.

It is a super-2 number, since 2×40226581² = 3236355637899122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40226587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20113290 + 20113291.

It is an arithmetic number, because the mean of its divisors is an integer number (20113291).

Almost surely, 2^40226581 is an apocalyptic number.

It is an amenable number.

40226581 is a deficient number, since it is larger than the sum of its proper divisors (1).

40226581 is an equidigital number, since it uses as much as digits as its factorization.

40226581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 40226581 is about 6342.4428259149. The cubic root of 40226581 is about 342.6397206417.

Adding to 40226581 its reverse (18562204), we get a palindrome (58788785).

The spelling of 40226581 in words is "forty million, two hundred twenty-six thousand, five hundred eighty-one".