40516649 has 2 divisors, whose sum is σ = 40516650. Its totient is φ = 40516648.

The previous prime is 40516633. The next prime is 40516673. The reversal of 40516649 is 94661504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37027225 + 3489424 = 6085^2 + 1868^2 .

It is a cyclic number.

It is not a de Polignac number, because 40516649 - 2⁴ = 40516633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40516849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20258324 + 20258325.

It is an arithmetic number, because the mean of its divisors is an integer number (20258325).

Almost surely, 2^40516649 is an apocalyptic number.

It is an amenable number.

40516649 is a deficient number, since it is larger than the sum of its proper divisors (1).

40516649 is an equidigital number, since it uses as much as digits as its factorization.

40516649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 40516649 is about 6365.2689652520. The cubic root of 40516649 is about 343.4613239672.

The spelling of 40516649 in words is "forty million, five hundred sixteen thousand, six hundred forty-nine".