49542809 has 2 divisors, whose sum is σ = 49542810. Its totient is φ = 49542808.

The previous prime is 49542781. The next prime is 49542833. The reversal of 49542809 is 90824594.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25532809 + 24010000 = 5053^2 + 4900^2 .

It is a cyclic number.

It is not a de Polignac number, because 49542809 - 2²⁰ = 48494233 is a prime.

It is a super-2 number, since 2×49542809² = 4908979847220962, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (49542109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24771404 + 24771405.

It is an arithmetic number, because the mean of its divisors is an integer number (24771405).

Almost surely, 2^49542809 is an apocalyptic number.

It is an amenable number.

49542809 is a deficient number, since it is larger than the sum of its proper divisors (1).

49542809 is an equidigital number, since it uses as much as digits as its factorization.

49542809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 49542809 is about 7038.6652854075. The cubic root of 49542809 is about 367.2768392326.

The spelling of 49542809 in words is "forty-nine million, five hundred forty-two thousand, eight hundred nine".