40872581 has 2 divisors, whose sum is σ = 40872582. Its totient is φ = 40872580.

The previous prime is 40872577. The next prime is 40872583. The reversal of 40872581 is 18527804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29757025 + 11115556 = 5455^2 + 3334^2 .

It is a cyclic number.

It is not a de Polignac number, because 40872581 - 2² = 40872577 is a prime.

It is a super-2 number, since 2×40872581² = 3341135755203122, which contains 22 as substring.

Together with 40872583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40872583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20436290 + 20436291.

It is an arithmetic number, because the mean of its divisors is an integer number (20436291).

Almost surely, 2^40872581 is an apocalyptic number.

It is an amenable number.

40872581 is a deficient number, since it is larger than the sum of its proper divisors (1).

40872581 is an equidigital number, since it uses as much as digits as its factorization.

40872581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 40872581 is about 6393.1667427027. The cubic root of 40872581 is about 344.4641432793.

The spelling of 40872581 in words is "forty million, eight hundred seventy-two thousand, five hundred eighty-one".