40539091 has 2 divisors, whose sum is σ = 40539092. Its totient is φ = 40539090.

The previous prime is 40539061. The next prime is 40539137. The reversal of 40539091 is 19093504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40539091 - 2⁷ = 40538963 is a prime.

It is not a weakly prime, because it can be changed into another prime (40539001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20269545 + 20269546.

It is an arithmetic number, because the mean of its divisors is an integer number (20269546).

Almost surely, 2^40539091 is an apocalyptic number.

40539091 is a deficient number, since it is larger than the sum of its proper divisors (1).

40539091 is an equidigital number, since it uses as much as digits as its factorization.

40539091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 40539091 is about 6367.0315689495. The cubic root of 40539091 is about 343.5247261860.

The spelling of 40539091 in words is "forty million, five hundred thirty-nine thousand, ninety-one".