40581337 has 2 divisors, whose sum is σ = 40581338. Its totient is φ = 40581336.

The previous prime is 40581313. The next prime is 40581403. The reversal of 40581337 is 73318504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34351321 + 6230016 = 5861^2 + 2496^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40581337 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 40581299 and 40581308.

It is not a weakly prime, because it can be changed into another prime (40582337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20290668 + 20290669.

It is an arithmetic number, because the mean of its divisors is an integer number (20290669).

Almost surely, 2^40581337 is an apocalyptic number.

It is an amenable number.

40581337 is a deficient number, since it is larger than the sum of its proper divisors (1).

40581337 is an equidigital number, since it uses as much as digits as its factorization.

40581337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 40581337 is about 6370.3482636352. The cubic root of 40581337 is about 343.6440144001.

The spelling of 40581337 in words is "forty million, five hundred eighty-one thousand, three hundred thirty-seven".