40502081 has 2 divisors, whose sum is σ = 40502082. Its totient is φ = 40502080.

The previous prime is 40502069. The next prime is 40502101. The reversal of 40502081 is 18020504.

It is an a-pointer prime, because the next prime (40502101) can be obtained adding 40502081 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34621456 + 5880625 = 5884^2 + 2425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40502081 is a prime.

It is a super-2 number, since 2×40502081² = 3280837130661122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40502681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20251040 + 20251041.

It is an arithmetic number, because the mean of its divisors is an integer number (20251041).

Almost surely, 2^40502081 is an apocalyptic number.

It is an amenable number.

40502081 is a deficient number, since it is larger than the sum of its proper divisors (1).

40502081 is an equidigital number, since it uses as much as digits as its factorization.

40502081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 40502081 is about 6364.1245273800. The cubic root of 40502081 is about 343.4201545179.

Adding to 40502081 its reverse (18020504), we get a palindrome (58522585).

The spelling of 40502081 in words is "forty million, five hundred two thousand, eighty-one".