40909549 has 2 divisors, whose sum is σ = 40909550. Its totient is φ = 40909548.

The previous prime is 40909543. The next prime is 40909567. The reversal of 40909549 is 94590904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37822500 + 3087049 = 6150^2 + 1757^2 .

It is a cyclic number.

It is not a de Polignac number, because 40909549 - 2²³ = 32520941 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40909543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20454774 + 20454775.

It is an arithmetic number, because the mean of its divisors is an integer number (20454775).

Almost surely, 2^40909549 is an apocalyptic number.

It is an amenable number.

40909549 is a deficient number, since it is larger than the sum of its proper divisors (1).

40909549 is an equidigital number, since it uses as much as digits as its factorization.

40909549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 40909549 is about 6396.0573011817. The cubic root of 40909549 is about 344.5679644136.

The spelling of 40909549 in words is "forty million, nine hundred nine thousand, five hundred forty-nine".