50690209 has 4 divisors (see below), whose sum is σ = 53672004. Its totient is φ = 47708416.

The previous prime is 50690197. The next prime is 50690221. The reversal of 50690209 is 90209605.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90209605 = 5 ⋅18041921.

It is an interprime number because it is at equal distance from previous prime (50690197) and next prime (50690221).

It can be written as a sum of positive squares in 2 ways, for example, as 22896225 + 27793984 = 4785^2 + 5272^2 .

It is a cyclic number.

It is not a de Polignac number, because 50690209 - 2²¹ = 48593057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50690909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1490872 + ... + 1490905.

It is an arithmetic number, because the mean of its divisors is an integer number (13418001).

Almost surely, 2^50690209 is an apocalyptic number.

It is an amenable number.

50690209 is a deficient number, since it is larger than the sum of its proper divisors (2981795).

50690209 is a wasteful number, since it uses less digits than its factorization.

50690209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2981794.

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

The square root of 50690209 is about 7119.7056821192. The cubic root of 50690209 is about 370.0905768021.

The spelling of 50690209 in words is "fifty million, six hundred ninety thousand, two hundred nine".